index_prefixes §

PUT boxoffice_hit_movies
{
    "mappings": {
        "properties": {
            "title": {
                "type": "text",
                "index_prefixes": {}
            }
        }
    }
}

The sole title property includes an additional property, index_prefixes. This indicates to the engine that during the indexing process, it should create the field with prebuilt prefixes and store those values. It can speed up prefix queries.