Brian is right, if you map your field as not_analyzed, then you can do 
exact case-sensitive matches on it, as well as term facets/aggregations and 
sorts. This applies to fields like IDs, Guids, or anything you can think of 
that you don't want tokenized:

{
  "mappings": {
    "doc": {
      "properties": {
        "Id": {
          "type": "string",
          "index": "not_analyzed"
        }
      }
    }
  }
}

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