diff --git a/core/db/elastic.py b/core/db/elastic.py
index 13cd018..c27a771 100644
--- a/core/db/elastic.py
+++ b/core/db/elastic.py
@@ -146,7 +146,7 @@ class ElasticsearchBackend(StorageBackend):
                 "fuzzy_max_expansions": 50,
                 "fuzzy_prefix_length": 0,
                 # "minimum_should_match": 1,
-                "default_operator": "or",
+                "default_operator": "and",
                 "analyzer": "standard",
                 "lenient": True,
                 "boost": 1,