Elasticsearch TERM regex aggregation

Elastic Stack Elasticsearch
1

I'm migrating an application from Elasticsearch 1.7.5 to 2.4.4. One of the last issues I've encountered is flags are no longer supported. In the examples below, I'm trying to aggregate on a field to find tag values that start with "ja" (case insensitive). Is there an equivalent way to express this query from 1.7.5 in 2.4.4?

{
  "size": 0,
  "aggregations" : {
    "tags" : {
      "terms" : {
        "field" : "tags.value_unanalyzed",
        "size" : 25,
        "order" : [ {
          "_count" : "desc"
        }, {
          "_term" : "asc"
        } ],
        "include" : {
          "pattern" : "^\\Qja\\E.*$",
          "flags" : 2
        }
      }
    }
  }
}

The only thing I've come up with in 2.4.4 is this:

{
  "size": 0,
  "aggregations" : {
    "tags" : {
      "terms" : {
        "field" : "tags.value_unanalyzed",
        "size" : 25,
        "order" : [ {
          "_count" : "desc"
        }, {
          "_term" : "asc"
        } ],
        "include" : "(JA|ja|Ja|jA).*"
      }
    }
  }
}

While this aggregation "does the job," it becomes expensive and slow very quickly. Is there another way I can express this query to get the equivalent case-insensitive starts-with behavior on a TERM aggregation from 1.7.5?

2

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