Induction to Monitoring - ElasticSearch (ES) for Open Travel Data (OPTD) QA

Overview

That repository aims at providing end-to-end examples introducing how to collect, store and query metering events, produced by different sensors on local as well as on clouds.

Although the software stacks are very similar with logging, their purpose is different. See the GitHub repository dedicated to logging for further details.

In those tutorials, Elasticsearch (ES) stacks (e.g., ELK, EFK) are used. A full end-to-end example is explained step by step, and actually used for the Quality Assurance (QA) of the Open Travel Data (OPTD) project.

The full details on how to setup an ES cluster on Proxmox LXC containers are given in the dedicated elasticsearch/ sub-folder. Such an ES cluster is actually the publishing target of the Quality Assurance (QA) events of the Open Travel Data (OPTD) project, produced by the OPTD Travis CI/CD process.

For convenience, most of the ES examples are demonstrated both on a local single-node installation (e.g., on a laptop) and on on the above-mentioned cluster.

This project also features, in a dedicated python/ sub-folder, a datamonitor Python module, supporting:

collecting Key Performance Indicators (KPI) from data files
and sending meta-data JSON documents to the ES service

Travis manages the CI pipeline.

Endpoints

ElasticSearch (ES):
- Local installation: http://localhost:9200
- Remote cluster (through SSH tunnel): http://localhost:9400
Kibana:
- Local installation: http://localhost:5601
- Remote cluster: https://kibana.example.com
- Index management:
  - Local indices: http://localhost:5601/app/kibana#/management/elasticsearch/index_management/indices
  - Remote indices: https://kibana.example.com/app/kibana#/management/elasticsearch/index_management/indices
  - Local index templates: http://localhost:5601/app/kibana#/management/elasticsearch/index_management/templates
  - Remote index templates: https://kibana.example.com/app/kibana#/management/elasticsearch/index_management/templates
  - Local index patterns: http://localhost:5601/app/kibana#/management/kibana/index_patterns/
  - Remote index patterns: https://kibana.example.com/app/kibana#/management/kibana/index_patterns/
- DevTool console:
  - Local installation: http://localhost:5601/app/kibana#/dev_tools/console
  - Remote cluster: https://kibana.example.com/app/kibana#/dev_tools/console

Table of Content (ToC)

Induction to Monitoring - ElasticSearch (ES) for Open Travel Data (OPTD) QA
Overview
- Endpoints
Table of Content (ToC)
References
Configuration
Build a CSV to JSON pipeline
- School data
- New York

Table of contents generated with markdown-toc

References

Ingest processors

Main: https://www.elastic.co/guide/en/elasticsearch/reference/current/ingest-processors.html
Grok processor
CSV processor
Date processor
Script processor

Use cases

Open Travel Data (OPTD)

Configuration

Interact with the ES server through the command-line (CLI)

Interact with the local ES installation:

$ curl -XGET "http://localhost:9200/"|jq
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                               Dload  Upload   Total   Spent    Left  Speed
100   542  100   542    0     0   1460      0 --:--:-- --:--:-- --:--:--  1456

{
"name": "D-A-MBPro",
"cluster_name": "elasticsearch_darnaud",
"cluster_uuid": "G7YM0RZsRtW3DjoM0sIx_A",
"version": {
  "number": "7.6.2",
  "build_flavor": "default",
  "build_type": "tar",
  "build_hash": "ef48eb35cf30adf4db14086e8aabd07ef6fb113f",
  "build_date": "2020-03-26T06:34:37.794943Z",
  "build_snapshot": false,
  "lucene_version": "8.4.0",
  "minimum_wire_compatibility_version": "6.8.0",
  "minimum_index_compatibility_version": "6.0.0-beta1"
},
"tagline": "You Know, for Search"
}

Interact with the remote ES cluster through the SSH tunnel:

$ ssh root@tiproxy8 -f -L9400:10.30.2.191:9200 sleep 5; curl -XGET "http://localhost:9400/"|jq
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                               Dload  Upload   Total   Spent    Left  Speed
100   533  100   533    0     0    164      0  0:00:03  0:00:03 --:--:--   164

{
"name": "node-1",
"cluster_name": "titsc-escluster",
"cluster_uuid": "29nOWLHZRMOQWfkOjEWLcA",
"version": {
  "number": "7.6.2",
  "build_flavor": "default",
  "build_type": "rpm",
  "build_hash": "ef48eb35cf30adf4db14086e8aabd07ef6fb113f",
  "build_date": "2020-03-26T06:34:37.794943Z",
  "build_snapshot": false,
  "lucene_version": "8.4.0",
  "minimum_wire_compatibility_version": "6.8.0",
  "minimum_index_compatibility_version": "6.0.0-beta1"
},
"tagline": "You Know, for Search"
}

Kibana

Setup Kibana to disallow the read-only mode:

$ curl -XPUT "http://localhost:9200/.kibana/_settings" -H "Content-Type: application/json" --data "@elasticseearch/settings/kibana-read-only.json"|jq
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                               Dload  Upload   Total   Spent    Left  Speed
100    89  100    21  100    68    265    860 --:--:-- --:--:-- --:--:--  1126

{
"acknowledged": true
}

$ ssh root@tiproxy8 -f -L9400:10.30.2.191:9200 sleep 5; curl -XPUT "http://localhost:9400/.kibana/_settings" -H "Content-Type: application/json" --data "@elasticseearch/settings/kibana-read-only.json"|jq
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                               Dload  Upload   Total   Spent    Left  Speed
100    89  100    21  100    68      2      8  0:00:10  0:00:07  0:00:03     5

{
"acknowledged": true
}

$ curl -XPUT "http://localhost:9200/subway_info_v1/_settings" -H "Content-Type: application/json" --data "@elasticseearch/settings/kibana-read-only.json"|jq
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                               Dload  Upload   Total   Spent    Left  Speed
100    89  100    21  100    68    106    345 --:--:-- --:--:-- --:--:--   451

{
"acknowledged": true
}

Check the Kibana settings:

$ curl -XGET "http://localhost:9200/.kibana/_settings"|jq
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                               Dload  Upload   Total   Spent    Left  Speed
100   304  100   304    0     0  13217      0 --:--:-- --:--:-- --:--:-- 13217

{
".kibana_1": {
  "settings": {
    "index": {
      "number_of_shards": "1",
      "auto_expand_replicas": "0-1",
      "blocks": {
        "read_only_allow_delete": "false"
      },
      "provided_name": ".kibana_1",
      "creation_date": "1582893825396",
      "number_of_replicas": "0",
      "uuid": "vXk2I7kXQOerlcnAbqlggQ",
      "version": {
        "created": "7060099",
        "upgraded": "7060199"
      }
    }
  }
}
}

$ ssh root@tiproxy8 -f -L9400:10.30.2.191:9200 sleep 5; curl -XGET "http://localhost:9400/.kibana/_settings"|jq
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                               Dload  Upload   Total   Spent    Left  Speed
100   304  100   304    0     0     88      0  0:00:03  0:00:03 --:--:--    88

{
".kibana_2": {
  "settings": {
    "index": {
      "number_of_shards": "1",
      "auto_expand_replicas": "0-1",
      "blocks": {
        "read_only_allow_delete": "false"
      },
      "provided_name": ".kibana_2",
      "creation_date": "1582373355876",
      "number_of_replicas": "1",
      "uuid": "V8uYoV1zDZmQo9Jzu5a-LQ",
      "version": {
        "created": "7060099",
        "upgraded": "7060299"
      }
    }
  }
}
}

$ curl -XGET "http://localhost:9200/subway_info_v1/_settings"|jq
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                               Dload  Upload   Total   Spent    Left  Speed
100   285  100   285    0     0  47500      0 --:--:-- --:--:-- --:--:-- 47500

{
"subway_info_v1": {
  "settings": {
    "index": {
      "number_of_shards": "1",
      "blocks": {
        "read_only_allow_delete": "false"
      },
      "provided_name": "subway_info_v1",
      "creation_date": "1582928134403",
      "number_of_replicas": "1",
      "uuid": "GaFWZIFhSDO6iPOsPkNtCw",
      "version": {
        "created": "7060099",
        "upgraded": "7060199"
      }
    }
  }
}
}

Grok processor

List the patterns of the Grok processor:

$ curl -XGET "http://localhost:9200/_ingest/processor/grok/" |jq

{
"patterns": {
  "BACULA_CAPACITY": "%{INT}{1,3}(,%{INT}{3})*",
  "PATH": "(?:%{UNIXPATH}|%{WINPATH})",
 ...
  "DATA": ".*?", 
 ...
  "NUMBER": "(?:%{BASE10NUM})", 
 ...
  "WORD": "\\b\\w+\\b", 
 ...
  "CATALINALOG": "%{CATALINA_DATESTAMP:timestamp} %{JAVACLASS:class} %{JAVALOGMESSAGE:logmessage}"
}
}

There is a Grok processing simulator in the Kibana DevTool console:
- Local installation: http://localhost:5601/app/kibana#/dev_tools/grokdebugger
- Remote cluster: https://kibana.example.com/app/kibana#/dev_tools/grokdebugger
- Sample data:
```
BMT,4 Avenue,25th St,40.660397,-73.998091,R,,,,,,,,,,,Stair,YES,,YES,NONE,,FALSE,,FALSE,4th Ave,25th St,SW,40.660489,-73.99822
```
- Grok pattern: ```text %{WORD:division},%{DATA:line},%{DATA:station_name},%{NUMBER:location.lat},%{NUMBER:location.lon},%{DATA},%{DATA},%{DATA},%{DATA},%{DATA},%{DATA},%{DATA},%{DATA},%{DATA},%{DATA},%{DATA},%{DATA:entrance_type},%{DATA:entry},%{DATA:exit_only},%{DATA:vending},%{DATA:staffing},%{DATA:staff_hours},%{DATA:ada},%{DATA:ada_notes},%{DATA:free_crossover},%{DATA:north_south_street},%{DATA:east_west_street},%{DATA:corner},%{NUMBER:entrance.lat},%{NUMBER:entrance.lon}

# Build a CSV to JSON pipeline

## School data
* Create the `school` index:
```bash
$ curl -XPUT "http://localhost:9200/school"

{
  "acknowledged": true,
  "shards_acknowledged": true,
  "index": "school"
}

Insert a first entry:

$ curl -XPOST "http://localhost:9200/school/_doc/10" -H "Content-Type: application/json" -d'{ "name":"Saint Paul School", "description":"ICSE Afiliation", "street":"Dawarka", "city":"Delhi", "state":"Delhi", "zip":"110075", "location":[28.5733056, 77.0122136], "fees":5000, "tags":["Good Faculty", "Great Sports"], "rating":"4.5" }' | jq

{
"_index": "school",
"_type": "_doc",
"_id": "10",
"_version": 1,
"result": "created",
"_shards": {
  "total": 2,
  "successful": 1,
  "failed": 0
},
"_seq_no": 0,
"_primary_term": 1
}

Insert a second record:

$ curl -XPOST "http://localhost:9200/school/_doc/16" -H "Content-Type: application/json" -d'{ "name":"Crescent School", "description":"State Board Affiliation", "street":"Tonk Road", "city":"Jaipur", "state":"RJ", "zip":"176114","location":[26.8535922,75.7923988], "fees":2500, "tags":["Well equipped labs"], "rating":"4.5" }'

{
"_index": "school",
"_type": "_doc",
"_id": "16",
"_version": 1,
"result": "created",
"_shards": {
  "total": 2,
  "successful": 1,
  "failed": 0
},
"_seq_no": 1,
"_primary_term": 1
}

Check the content of the school index:

$ curl -XGET "http://localhost:9200/school/" | jq
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                               Dload  Upload   Total   Spent    Left  Speed
100   963  100   963    0     0  53500      0 --:--:-- --:--:-- --:--:-- 53500

{
"school": {
  "aliases": {},
  "mappings": {
    "properties": {
      "city": {
        "type": "text",
        "fields": {
          "keyword": {
            "type": "keyword",
            "ignore_above": 256
          }
        }
      },
      "description": {
        "type": "text",
        "fields": {
          "keyword": {
            "type": "keyword",
            "ignore_above": 256
          }
        }
      },
      "fees": {
        "type": "long"
      },
      "location": {
        "type": "float"
      },
      "name": {
        "type": "text",
        "fields": {
          "keyword": {
            "type": "keyword",
            "ignore_above": 256
          }
        }
      },
      "rating": {
        "type": "text",
        "fields": {
          "keyword": {
            "type": "keyword",
            "ignore_above": 256
          }
        }
      },
      "state": {
        "type": "text",
        "fields": {
          "keyword": {
            "type": "keyword",
            "ignore_above": 256
          }
        }
      },
      "street": {
        "type": "text",
        "fields": {
          "keyword": {
            "type": "keyword",
            "ignore_above": 256
          }
        }
      },
      "tags": {
        "type": "text",
        "fields": {
          "keyword": {
            "type": "keyword",
            "ignore_above": 256
          }
        }
      },
      "zip": {
        "type": "text",
        "fields": {
          "keyword": {
            "type": "keyword",
            "ignore_above": 256
          }
        }
      }
    }
  },
  "settings": {
    "index": {
      "creation_date": "1582925740110",
      "number_of_shards": "1",
      "number_of_replicas": "1",
      "uuid": "bFxqVAe5TbiV6-3ijh7hGg",
      "version": {
        "created": "7060099"
      },
      "provided_name": "school"
    }
  }
}
}

New York

Create the subway_info_v1 index:

$ curl -XPUT "http://localhost:9200/subway_info_v1" -H "Content-Type: application/json" --data "@elasticseearch/data/NYC_Index.json" | jq
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                               Dload  Upload   Total   Spent    Left  Speed
100   809  100    73  100   736     36    370  0:00:02  0:00:01  0:00:01   406

{
"acknowledged": true,
"shards_acknowledged": true,
"index": "subway_info_v1"
}

$ ssh root@tiproxy8 -f -L9400:10.30.2.191:9200 sleep 5; curl -XPUT "http://localhost:9400/subway_info_v1" -H "Content-Type: application/json" --data "@elasticseearch/data/NYC_Index.json" | jq

{
"acknowledged": true,
"shards_acknowledged": true,
"index": "subway_info_v1"
}

Check the index:

In the Kibana console: http://localhost:5601/app/kibana#/management/elasticsearch/index_management/indices

In the CLI:

$ curl -XGET "http://localhost:9200/subway_info_v1" | jq
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                             Dload  Upload   Total   Spent    Left  Speed
100   756  100   756    0     0  54000      0 --:--:-- --:--:-- --:--:-- 54000

{
"subway_info_v1": {
"aliases": {},
"mappings": {
  "properties": {
    "station_name": {
      "type": "text"
    },
    "east_west_street": {
      "type": "text"
    },
    "line": {
      "type": "text"
    },
    "vending": {
      "type": "text"
    },
    "staffing": {
      "type": "text"
    },
    "division": {
      "type": "keyword"
    },
    "entry": {
      "type": "text"
    },
    "exit_only": {
      "type": "text"
    },
    "corner": {
      "type": "text"
    },
    "north_south_street": {
      "type": "text"
    },
    "location": {
      "type": "geo_point"
    },
    "entrance": {
      "type": "geo_point"
    },
    "entrance_type": {
      "type": "text"
    },
    "ada_notes": {
      "type": "text"
    },
    "free_crossover": {
      "type": "text"
    },
    "ada": {
      "type": "text"
    },
    "staff_hours": {
      "type": "text"
    }
  }
},
"settings": {
  "index": {
    "creation_date": "1584483493748",
    "number_of_shards": "1",
    "number_of_replicas": "1",
    "uuid": "Jef7f_ijRF-t_khE8hKjag",
    "version": {
      "created": "7060199"
    },
    "provided_name": "subway_info_v1"
  }
}
}
}
```bash
$ ssh root@tiproxy8 -f -L9400:10.30.2.191:9200 sleep 5; curl -XGET "http://localhost:9400/subway_info_v1" | jq
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                             Dload  Upload   Total   Spent    Left  Speed
100   756  100   756    0     0  54000      0 --:--:-- --:--:-- --:--:-- 54000

{
"subway_info_v1": {
...
}
}

On single-node installations (e.g., on a laptop), the health sttatus of the index will appear as yellow, as the number of replicas is set by default to 1, which cannot be satisfied with a single node. The solution is to edit the settings of the index (e.g., from the Kibana console) and set the number_of_replicas field to 0.

$ curl -XGET "http://localhost:9200/subway_info_v1/_settings/" | jq '.subway_info_v1.settings.index.number_of_replicas'
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                               Dload  Upload   Total   Spent    Left  Speed
100   220  100   220    0     0   9565      0 --:--:-- --:--:-- --:--:--  9565

"0"

$ ssh root@tiproxy8 -f -L9400:10.30.2.191:9200 sleep 5; curl -XGET "http://localhost:9400/subway_info_v1/_settings/" | jq '.subway_info_v1.settings.index.number_of_replicas'
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                               Dload  Upload   Total   Spent    Left  Speed
100   220  100   220    0     0   9565      0 --:--:-- --:--:-- --:--:--  9565

"1"

Simulate the targetted pipeline:

$ curl -XPOST "http://localhost:9200/_ingest/pipeline/_simulate" -H "Content-Type: application/json" --data "@elasticseearch/data/NYC_Grok_Processor.json"|jq
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                               Dload  Upload   Total   Spent    Left  Speed
100  1558  100   547  100  1011   2111   3903 --:--:-- --:--:-- --:--:--  6015

{
"docs": [
  {
    "doc": {
      "_index": "subway_info",
      "_type": "station",
      "_id": "AVvJZVQEBr2flFKzrrkr",
      "_source": {
        "station_name": "25th St",
        "east_west_street": "25th St",
        "line": "4 Avenue",
        "vending": "YES",
        "staffing": "NONE",
        "division": "BMT",
        "entry": "YES",
        "exit_only": "",
        "corner": "SW",
        "north_south_street": "4th Ave",
        "location": {
          "lon": "-73.998091",
          "lat": "40.660397"
        },
        "entrance": {
          "lon": "-73.99822",
          "lat": "40.660489"
        },
        "entrance_type": "Stair",
        "ada_notes": "",
        "free_crossover": "FALSE",
        "timestamp": "2020-03-20T15:12:23.000+01:00",
        "staff_hours": "",
        "ada": "FALSE"
      },
      "_ingest": {
        "timestamp": "2020-03-17T20:33:38.724266Z"
      }
    }
  }
]
}

$ ssh root@tiproxy8 -f -L9400:10.30.2.191:9200 sleep 5; curl -XPOST "http://localhost:9400/_ingest/pipeline/_simulate" -H "Content-Type: application/json" --data "@elasticseearch/data/NYC_Grok_Processor.json"|jq
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                               Dload  Upload   Total   Spent    Left  Speed
100  1558  100   547  100  1011   2111   3903 --:--:-- --:--:-- --:--:--  6015

{
...
}

Create the index template:

$ curl -XPUT "http://localhost:9200/_template/nyc_template" -H "Content-Type: application/json" --data "@elasticseearch/data/NYC_Template.json"|jq

{
"acknowledged": true
}

Check the index template in the Kibana console:
- http://localhost:5601/app/kibana#/management/elasticsearch/index_management/templates

Check the index template with the CLI:

$ curl -XGET "http://localhost:9200/_template/nyc_template" | jq
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                               Dload  Upload   Total   Spent    Left  Speed
100   644  100   644    0     0  32200      0 --:--:-- --:--:-- --:--:-- 32200

{
"nyc_template": {
  "order": 0,
  "index_patterns": [
    "subway_info*"
  ],
  "settings": {
    "index": {
      "number_of_shards": "1"
    }
  },
  "mappings": {
    "properties": {
      "station_name": {
        "type": "text"
      },
      "east_west_street": {
        "type": "text"
      },
      "line": {
        "type": "text"
      },
      "vending": {
        "type": "text"
      },
      "staffing": {
        "type": "text"
      },
      "division": {
        "type": "keyword"
      },
      "entry": {
        "type": "text"
      },
      "exit_only": {
        "type": "text"
      },
      "corner": {
        "type": "text"
      },
      "north_south_street": {
        "type": "text"
      },
      "location": {
        "type": "geo_point"
      },
      "entrance": {
        "type": "geo_point"
      },
      "entrance_type": {
        "type": "text"
      },
      "ada_notes": {
        "type": "text"
      },
      "free_crossover": {
        "type": "text"
      },
      "ada": {
        "type": "text"
      },
      "staff_hours": {
        "type": "text"
      }
    }
  },
  "aliases": {}
}
}

Create the pipeline:

$ curl -XPUT "http://localhost:9200/_ingest/pipeline/parse_nyc_csv" -H "Content-Type: application/json" --data "@elasticseearch/data/NYC_Pipeline.json"|jq
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                               Dload  Upload   Total   Spent    Left  Speed
100   690  100    21  100   669     46   1467 --:--:-- --:--:-- --:--:--  1509

{
"acknowledged": true
}

Parser rule and sample data (for reference):

%{WORD:division},%{DATA:line},%{DATA:station_name},%{NUMBER:location.lat},%{NUMBER:location.lon},%{DATA},%{DATA},%{DATA},%{DATA},%{DATA},%{DATA},%{DATA},%{DATA},%{DATA},%{DATA},%{DATA},%{DATA:entrance_type},%{DATA:entry},%{DATA:exit_only},%{DATA:vending},%{DATA:staffing},%{DATA:staff_hours},%{DATA:ada},%{DATA:ada_notes},%{DATA:free_crossover},%{DATA:north_south_street},%{DATA:east_west_street},%{DATA:corner},%{NUMBER:entrance.lat},%{NUMBER:entrance.lon}
BMT,4 Avenue,25th St,40.660397,-73.998091,R,,,,,,,,,,,Stair,YES,,YES,NONE,,FALSE,,FALSE,4th Ave,25th St,SW,40.660489,-73.99822

Check the pipeline:
```
$ curl -XGET "http://localhost:9200/_ingest/pipeline/parse_nyc_csv" | jq
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                               Dload  Upload   Total   Spent    Left  Speed
100  1199  100  1199    0     0  14621      0 --:--:-- --:--:-- --:--:-- 14802
```
```javascript { “parse_nyc_csv”: { “description”: “Parsing the NYC stations”, “processors”: [ { “grok”: { “field”: “station”, “patterns”: [ “%{WORD:division},%{DATA:line},%{DATA:station_name},%{NUMBER:location.lat},%{NUMBER:location.lon},%{DATA},%{DATA},%{DATA},%{DATA},%{DATA},%{DATA},%{DATA},%{DATA},%{DATA},%{DATA},%{DATA},%{DATA:entrance_type},%{DATA:entry},%{DATA:exit_only},%{DATA:vending},%{DATA:staffing},%{DATA:staff_hours},%{DATA:ada},%{DATA:ada_notes},%{DATA:free_crossover},%{DATA:north_south_street},%{DATA:east_west_street},%{DATA:corner},%{NUMBER:entrance.lat},%{NUMBER:entrance.lon}” ] } }, { “remove”: { “field”: “station” } } ] } }

* Ingest the data:
```bash
$ while read f1; do curl -XPOST "http://localhost:9200/subway_info_v1/_doc?pipeline=parse_nyc_csv" -H "Content-Type: application/json" -d "{ \"station\": \"$f1\" }"; done < elasticseearch/data/NYC_Transit_Subway_Entrance_And_Exit_Data.csv | jq

{
  "_index": "subway_info_v1",
  "_type": "_doc",
  "_id": "iISt6nABC24yNP3yxmvI",
  "_version": 1,
  "result": "created",
  "_shards": {
    "total": 2,
    "successful": 1,
    "failed": 0
  },
  "_seq_no": 11,
  "_primary_term": 1
}
...
{
  "_index": "subway_info_v1",
  "_type": "_doc",
  "_id": "04Sv6nABC24yNP3yO3Jd",
  "_version": 1,
  "result": "created",
  "_shards": {
    "total": 2,
    "successful": 1,
    "failed": 0
  },
  "_seq_no": 1878,
  "_primary_term": 1
}

Check the index:

$ curl -XGET "http://localhost:9200/subway_info_v1/_count" | jq
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                               Dload  Upload   Total   Spent    Left  Speed
100    74  100    74    0     0   7400      0 --:--:-- --:--:-- --:--:--  8222

{
"count": 1879,
"_shards": {
  "total": 1,
  "successful": 1,
  "skipped": 0,
  "failed": 0
}