Field operators
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.. toctree::
    :maxdepth: 1
    :hidden:

    database.field_operators.clean_text_operator
    database.field_operators.collect_nouns_and_phrases_operator
    database.field_operators.copy_field_operator
    database.field_operators.count_terms_per_record_operator
    database.field_operators.delete_field_operator
    database.field_operators.fillna_operator
    database.field_operators.highlight_nouns_and_phrases_operator
    database.field_operators.merge_fields_operator
    database.field_operators.protected_fields
    database.field_operators.rename_field_operator
    database.field_operators.transform_field_operator