Field extractors
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.. toctree::
    :maxdepth: 1
    :hidden:

    database.field_extractors.contains_extractor
    database.field_extractors.ends_with_extractor
    database.field_extractors.fields_difference_extractor
    database.field_extractors.fields_intersection_extractor
    database.field_extractors.full_match_extractor
    database.field_extractors.match_extractor
    database.field_extractors.starts_with_extractor
    database.field_extractors.stemming_and_extractor
    database.field_extractors.stemming_or_extractor
    database.field_extractors.top_terms_extractor