removing extra index from assertion on index_exists test

tests/lib/test_elasticsearch_client.py

@@ -377,7 +377,7 @@ class TestIndexExists(ElasticsearchClientTest):
             self.es_client.create_index('test_index')
         time.sleep(1)
         indices = self.es_client.index_exists('test_index')
-        assert indices == [self.event_index_name, 'test_index']
+        assert indices == ['test_index']
 
 
 class TestClusterHealth(ElasticsearchClientTest):