1. Health API

Health Check

1	curl -X GET "http://{{host}}:9200/_cat/health?v"

Green - everything is good (cluster is fully functional)
- Note: When a cluster is red, it will continue to serve search requests from the available shards but you will likely need to fix it ASAP since there are unassigned shards.
Yellow - all data is available but some replicas are not yet allocated (cluster is fully functional)
Red - some data is not available for whatever reason (cluster is partially functional)

List Nodes

1	curl "http://{{host}}:9200/_cat/nodes?v"

2. Indices API

2.1 List

1	curl "http://{{host}}:9200/_cat/indices?v"

2.2 Create

1 2	curl -X PUT "http://{{host}}:9200/customer?pretty" curl "http://{{host}}:9200/_cat/indices?v"

2.3 Delete

1 2	curl -X DELETE "http://{{host}}:9200/customer?pretty" curl "http://{{host}}:9200/_cat/indices?v"

3. Document API

3.1 Query

1
2
3

curl "http://{{host}}:9200/movies/movie/1"
curl "http://{{host}}:9200/movies/_search?q=Dark"

have another posts talk about query

3.2 Create

1
2

curl -X PUT "http://{{host}}:9200/movies/movie/109487" -H 'Content-Type: application/json' -d '{ "genre": ["IMAX", "Sci-Fi"], "title": "Interstellar", "year": 2014 }'
curl "http://{{host}}:9200/movies/movie/109487"

3.3 Update

1	curl -X POST "http://{{host}}:9200/movies/movie/109487/_update" -H 'Content-Type: application/json' -d '{ "doc": { "title": "Interstellar" } }'

Every document has a _version field
Elasticsearch documents are immutable.

a new document is created with an incremented _version
the old doc is marked for deletion

3.4 Delete

1	curl -X DELETE "http://{{host}}:9200/movies/movie/109487"