diff --git a/src/main/java/com/google/gerrit/elasticsearch/ElasticSetting.java b/src/main/java/com/google/gerrit/elasticsearch/ElasticSetting.java
index c054da6..2fcfc90 100644
--- a/src/main/java/com/google/gerrit/elasticsearch/ElasticSetting.java
+++ b/src/main/java/com/google/gerrit/elasticsearch/ElasticSetting.java
@@ -16,7 +16,6 @@
 
 import com.google.common.collect.ImmutableMap;
 import com.google.gson.annotations.SerializedName;
-import java.util.HashMap;
 import java.util.Map;
 
 class ElasticSetting {
@@ -60,12 +59,7 @@
 
       FieldProperties analyzer = new FieldProperties();
       analyzer.customWithCharFilter = customAnalyzer;
-      analyzer.keywordTokenizer =
-          new HashMap<>() {
-            {
-              put("tokenizer", "keyword");
-            }
-          };
+      analyzer.keywordTokenizer = ImmutableMap.of("tokenizer", "keyword");
       fields.put("analyzer", analyzer);
       return this;
     }