diff --git a/graylog2-server/src/main/java/org/graylog2/indexer/IndexMapping.java b/graylog2-server/src/main/java/org/graylog2/indexer/IndexMapping.java
index 3565d95897bc..fcd61b2daa4e 100644
--- a/graylog2-server/src/main/java/org/graylog2/indexer/IndexMapping.java
+++ b/graylog2-server/src/main/java/org/graylog2/indexer/IndexMapping.java
@@ -52,9 +52,7 @@ public Map<String, Object> messageMapping(final String analyzer) {
         return ImmutableMap.of(
                 "properties", partFieldProperties(analyzer),
                 "dynamic_templates", partDefaultAllInDynamicTemplate(),
-                "_source", enabled(),
-                // Enable purging by TTL
-                "_ttl", enabled());
+                "_source", enabled());
     }
 
     /*