ElasticChangeIndex: Fix typo in exception message

Change-Id: I63eba78f9dae1756e24ffbe21737747b9a5e373c
diff --git a/gerrit-elasticsearch/src/main/java/com/google/gerrit/elasticsearch/ElasticChangeIndex.java b/gerrit-elasticsearch/src/main/java/com/google/gerrit/elasticsearch/ElasticChangeIndex.java
index afd5756..762b868 100644
--- a/gerrit-elasticsearch/src/main/java/com/google/gerrit/elasticsearch/ElasticChangeIndex.java
+++ b/gerrit-elasticsearch/src/main/java/com/google/gerrit/elasticsearch/ElasticChangeIndex.java
@@ -112,7 +112,7 @@
           mappingBuilder.addString(name);
         } else {
           throw new IllegalArgumentException(
-              "Unsupported filed type " + fieldType.getName());
+              "Unsupported field type " + fieldType.getName());
         }
       }
       MappingProperties mapping = mappingBuilder.build();