I ran pushed a 1000 docs into ES 5.4 to allow the mapping to be automatically generated and see the object below in the mapping but it is not coming from my data. Any idea what this is and what it is used for? Any info would be appreciated. Thanks.

Kevin

"query" : {
            "properties" : {
              "match_all" : {
                "type" : "object"
              }
            }
          }

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