Fielddata stats

I am on ElasticSearch 6.3 and there are no text fields in my schema with fielddata enabled (but I do have keyword fields). When I do GET /_stats/fielddata?fields=* , I see something like

` "_all" : {
    "primaries" : {
      "fielddata" : {
        "memory_size_in_bytes" : 142037928,
        "evictions" : 0,
        "fields" : {
          "abc.keyword" : {
            "memory_size_in_bytes" : 872
          },
          "xyz.keyword" : {
            "memory_size_in_bytes" : 29720
          },
		  
...

   "posts-000051" : {
      "uuid" : "abcde",
      "primaries" : {
        "fielddata" : {
          "memory_size_in_bytes" : 516388,
          "evictions" : 0,
          "fields" : {
            "abc.keyword" : {
              "memory_size_in_bytes" : 8864
            },
            "xyz.keyword" : {
              "memory_size_in_bytes" : 4616
            },`

The question is, what does "fielddata" mean here? Isn't fielddata disabled by default on text fields? Don't keyword fields use docvalues? So what is this data shown above? Shouldn't the query return all zeroes if there are no text fields with fielddata explicitly enabled? How can a keyword field have fielddata associated with it?

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