Remove unused method.

Author: WaVEV

django_mongodb_backend/compiler.py

@@ -209,9 +209,6 @@ def _get_group_id_expressions(self, order_by):
             ids = self.get_project_fields(tuple(columns), force_expression=True)
         return ids, replacements
 
-    def _build_search_pipeline(self, search_queries):
-        pass
-
     def _build_aggregation_pipeline(self, ids, group):
         """Build the aggregation pipeline for grouping."""
         pipeline = []