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Wrapper query

A query that accepts any other query as base64 encoded string.

GET /_search
{
  "query": {
    "wrapper": {
      "query": "eyJ0ZXJtIiA6IHsgInVzZXIuaWQiIDogImtpbWNoeSIgfX0=" 
    }
  }
}

Base64 encoded string: {"term" : { "user.id" : "kimchy" }}

This query is more useful in the context of the Java high-level REST client or transport client to also accept queries as json formatted string. In these cases queries can be specified as a json or yaml formatted string or as a query builder (which is a available in the Java high-level REST client).

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https://www.elastic.co/guide/en/elasticsearch/reference/7.17/query-dsl-wrapper-query.html