diff --git a/java/com/google/gerrit/elasticsearch/ElasticProjectIndex.java b/java/com/google/gerrit/elasticsearch/ElasticProjectIndex.java
index a4046cde70..e9194c769e 100644
--- a/java/com/google/gerrit/elasticsearch/ElasticProjectIndex.java
+++ b/java/com/google/gerrit/elasticsearch/ElasticProjectIndex.java
@@ -54,7 +54,6 @@ public class ElasticProjectIndex extends AbstractElasticIndex<Project.NameKey, P
   }
 
   static final String PROJECTS = "projects";
-  static final String PROJECTS_PREFIX = PROJECTS + "_";
 
   private final ProjectMapping mapping;
   private final Provider<ProjectCache> projectCache;
@@ -66,7 +65,7 @@ public class ElasticProjectIndex extends AbstractElasticIndex<Project.NameKey, P
       Provider<ProjectCache> projectCache,
       JestClientBuilder clientBuilder,
       @Assisted Schema<ProjectData> schema) {
-    super(cfg, sitePaths, schema, clientBuilder, PROJECTS_PREFIX);
+    super(cfg, sitePaths, schema, clientBuilder, PROJECTS);
     this.projectCache = projectCache;
     this.mapping = new ProjectMapping(schema);
   }
diff --git a/javatests/com/google/gerrit/elasticsearch/ElasticTestUtils.java b/javatests/com/google/gerrit/elasticsearch/ElasticTestUtils.java
index e38c59a5d8..1936707cf9 100644
--- a/javatests/com/google/gerrit/elasticsearch/ElasticTestUtils.java
+++ b/javatests/com/google/gerrit/elasticsearch/ElasticTestUtils.java
@@ -20,7 +20,7 @@ import static com.google.gerrit.elasticsearch.ElasticChangeIndex.CHANGES;
 import static com.google.gerrit.elasticsearch.ElasticChangeIndex.CLOSED_CHANGES;
 import static com.google.gerrit.elasticsearch.ElasticChangeIndex.OPEN_CHANGES;
 import static com.google.gerrit.elasticsearch.ElasticGroupIndex.GROUPS;
-import static com.google.gerrit.elasticsearch.ElasticProjectIndex.PROJECTS_PREFIX;
+import static com.google.gerrit.elasticsearch.ElasticProjectIndex.PROJECTS;
 
 import com.google.common.base.Strings;
 import com.google.common.io.Files;
@@ -169,7 +169,7 @@ final class ElasticTestUtils {
         .client()
         .admin()
         .indices()
-        .prepareCreate(String.format("%s%04d", PROJECTS_PREFIX, projectSchema.getVersion()))
+        .prepareCreate(String.format("%s_%04d", PROJECTS, projectSchema.getVersion()))
         .addMapping(ElasticProjectIndex.PROJECTS, gson.toJson(projectMapping))
         .execute()
         .actionGet();