Elasticsearch first plugin - WIP

This plugin adds a first aggregation function.

This function selects a field value from the first document encountered in an aggregation group.

Installation

bin/plugin --install first-plugin --url TBD

First aggregation

The first function selects a value from the first document encountered in the aggregation group.

Example:

"aggs": {
  "<agg_name>": {
    "field": { 
      "first": { 
        "field" : "<field_name>"
      }
    }
  }
}

Result :

{
  "aggregations": {
    "<agg_name>": {
      "value": <first value of field_name>
    }
  }
}