diff --git a/modules/elasticsearch/src/main/java/org/elasticsearch/common/lucene/search/MatchAllDocsFilter.java b/modules/elasticsearch/src/main/java/org/elasticsearch/common/lucene/search/MatchAllDocsFilter.java
index 263d16ea966..7ab401c78b2 100644
--- a/modules/elasticsearch/src/main/java/org/elasticsearch/common/lucene/search/MatchAllDocsFilter.java
+++ b/modules/elasticsearch/src/main/java/org/elasticsearch/common/lucene/search/MatchAllDocsFilter.java
@@ -55,4 +55,8 @@ public class MatchAllDocsFilter extends Filter {
 
         return false;
     }
+
+    @Override public String toString() {
+        return "*:*";
+    }
 }