ElasticSearch POST with json search body vs GET with json in url

source is not a valid query string argument according to URI Search

Elasticsearch allows three ways to perform a search request...

GET with request body:

curl -XGET "http://localhost:9200/app/users/_search" -d '{  "query": {    "term": {      "email": "foo@gmail.com"    }  }}'

POST with request body:

Since not all clients support GET with body, POST is allowed as well.

curl -XPOST "http://localhost:9200/app/users/_search" -d '{  "query": {    "term": {      "email": "foo@gmail.com"    }  }}'

GET without request body:

curl -XGET "http://localhost:9200/app/users/_search?q=email:foo@gmail.com"

or (if you want to manually URL encode your query string)

curl -XGET "http://localhost:9200/app/users/_search?q=email%3Afoo%40gmail.com"

You should URL encode your query in the first case:

http://localhost:9200/app/users/_search?source=%7b%22query%22%3a+%7b%22term%22%3a+%7b%22email%22%3a%22foo%40gmail.com%22%7d%7d%7d

The above answers are not compatible with the Elastic search Version 6.0 and above.The ES introduced Strict Content type check from the version 6.0.The link explains it:https://www.elastic.co/blog/strict-content-type-checking-for-elasticsearch-rest-requests.For curl, need to add -H'Content-Type: application/json' to the command line of any request that has a JSON body