elasticsearch/docs/reference/query-languages/query-dsl/query-dsl-span-first-query.md

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Span first	https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-span-first-query.html

Span first query [query-dsl-span-first-query]

Matches spans near the beginning of a field. Here is an example:

GET /_search
{
  "query": {
    "span_first": {
      "match": {
        "span_term": { "user.id": "kimchy" }
      },
      "end": 3
    }
  }
}

The match clause can be any other span type query. The end controls the maximum end position permitted in a match.