elasticsearchHow can I delete documents from my Elasticsearch index using the delete by query API?

Using the delete by query API, you can delete documents from an Elasticsearch index. The API takes a query in the form of a JSON object and uses it to select documents that should be deleted.

Example code

DELETE /index_name/_delete_by_query
{
  "query": {
    "match_all": {}
  }
}

The above code will delete all documents from the index called index_name.

The query object can be used to specify more specific conditions for which documents should be deleted. For example, the following code will delete all documents with the field title equal to My Document:

DELETE /index_name/_delete_by_query
{
  "query": {
    "match": {
      "title": "My Document"
    }
  }
}

The delete by query API also supports more advanced query types such as range queries and wildcard queries.

Code explanation

1. DELETE /index_name/_delete_by_query - This is the API call used to delete documents from an Elasticsearch index.
2. { "query": { "match_all": {} } } - This is the query object used to select which documents should be deleted.
3. { "query": { "match": { "title": "My Document" } } } - This is an example of a more specific query object used to delete documents with the field title equal to My Document.

Helpful links

• Elasticsearch Delete By Query API
• Elasticsearch Query DSL

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