Match all query

The most simple query, which matches all documents, giving them all a _score of 1.0.

 GET /_search { "query": { "match_all": {} } }

The _score can be changed with the boost parameter:

 GET /_search { "query": { "match_all": { "boost" : 1.2 } } }

Match None Query

This is the inverse of the match_all query, which matches no documents.

 GET /_search { "query": { "match_none": {} } }