I inherited a project that has an Elasticsearch mapping like this, but the data is all stored in the same documents. That is, there are no actual parent/child mappings so is include_in_parent even useful in this case? If so, what does it buy me? Nested queries work as expected so I am inclined to just remove include_in_parent from the mapping but thought I would ask the question first.  Any thoughts would be appreciated. Thanks.

Kevin

......
     "disambigMismatches" : {
          "type" : "nested",
          "include_in_parent" : true,
          "properties" : {
            "completeMismatch" : {
              "type" : "boolean"
            },
            "context" : {
              "type" : "string"
            },
            "disambigId" : {
              "type" : "long"
            },
            "disambigScore" : {
              "type" : "double"
            },
            "mismatchText" : {
              "type" : "string",
              "index": "not_analyzed"
            }
          }
      }......
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