char *

       MongoDB, Inc

       2009-present, MongoDB, Inc.

1.30.4                                            Jun 08, 2025         MONGOC_COLLECTION_KEYS_TO_INDEX_STRING(3)

       This  function  returns the canonical stringification of a given key specification. See ManageCollectionIndexes for example usage.

       It is a programming error to call this function on a non-standard index, such one other than  a  straight
       index with ascending and descending.

       • keys: A bson_t. This is expected to match the form of the key field in the createIndexes command.

       A string that should be freed with bson_free().

          char *
          mongoc_collection_keys_to_index_string (const bson_t *keys);