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Basic Usage

The record option specifies how much information is recorded with an indexed field. By default, all fields use position. 
CREATE INDEX search_idx ON mock_items
USING bm25 (id, description)
WITH (
    key_field='id',
    text_fields='{
        "description": {"record": "freq"}
    }'
);
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basic
Records only the document IDs.
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freq
Records the document IDs as well as term frequency. This is useful for BM25 scoring.
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position
Records the document ID, term frequency and positions of occurrences. Required to run a phrase query.