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Filter Operator

A query can be filtered by another query. There are two ways to apply a filter to a query depending whether you want to include or exclude documents:

• _filter - Matches documents which match both subqueries, but the weight is only taken from the left subquery (in other respects it acts like _and.
• _and_not - Matches documents which match the left subquery but don’t match the right hand one (with weights coming from the left subquery)

Example

For example, the following matches all who like bananas filtering the results to those who also are brown-eyed females, but this filter doesn’t affect weights:

SEARCH /bank/
{
  "_query": {
    "_filter": [
      {
        "favoriteFruit": "banana"
      },
      {
        "_and": [
            { "gender": "female" },
            { "eyeColor": "brown" }
        ]
      }
    ]
  }
}

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