Revert "Logging stacktrace for all calls to EdxElasticsearchSearchBackend.setup()"

This reverts commit a0d539d678d0576e38f9284ba3ca58ee6c4e52f9.

course_discovery/apps/edx_haystack_extensions/backends.py

-import logging
-import traceback
-
 from haystack.backends.elasticsearch_backend import ElasticsearchSearchBackend, ElasticsearchSearchEngine
 
 from course_discovery.apps.edx_haystack_extensions.elasticsearch_boost_config import get_elasticsearch_boost_config
 
-logger = logging.getLogger(__name__)
-
 
 class SimpleQuerySearchBackendMixin(object):
     """
@@ -133,10 +128,6 @@ class EdxElasticsearchSearchBackend(SimpleQuerySearchBackendMixin, NonClearingSe
 
         return super().search(query_string, **kwargs)
 
-    def setup(self):
-        logger.info('DEBUG: EdxElasticsearchSearchBackend.setup() called: %s', '\n'.join(traceback.format_stack()))
-        return super().setup()
-
 
 class EdxElasticsearchSearchEngine(ElasticsearchSearchEngine):
     backend = EdxElasticsearchSearchBackend