[fti] add cw_fti_index_rql_limit method Improves on and deprecate cw_fti_index_rql_queries: execute the rql directly, so that we don't need to compute the set of eids up-front, but can just keep track of the last seen entity. Use the new method in reindex_entities. Keep calling cw_fti_index_rql_queries if it has been redefined (e.g in cubes). Related to #3621392.

Latest changes 
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* table of `all latest changes`_

Links below is providing useful RQL query example.

.. _all latest changes: ../view?rql=Any+M%2CX+WHERE+X+modification_date+M+ORDERBY+M+DESC+LIMIT+30