diff --git a/elasticsearch/src/main/java/org/elasticsearch/xpack/prelert/job/Job.java b/elasticsearch/src/main/java/org/elasticsearch/xpack/prelert/job/Job.java
index 678589b9ae9..eb6ea2af278 100644
--- a/elasticsearch/src/main/java/org/elasticsearch/xpack/prelert/job/Job.java
+++ b/elasticsearch/src/main/java/org/elasticsearch/xpack/prelert/job/Job.java
@@ -46,9 +46,6 @@ import java.util.TreeSet;
  */
 public class Job extends AbstractDiffable<Job> implements Writeable, ToXContent {
 
-    public static final Job PROTO =
-            new Job(null, null, null, null, null, 0L, null, null, null, null, null, null, null, null, null, null, null, null, null);
-
     public static final String TYPE = "job";
 
     /*
diff --git a/elasticsearch/src/main/java/org/elasticsearch/xpack/prelert/job/metadata/Allocation.java b/elasticsearch/src/main/java/org/elasticsearch/xpack/prelert/job/metadata/Allocation.java
index b92c8a360cd..68e7041967d 100644
--- a/elasticsearch/src/main/java/org/elasticsearch/xpack/prelert/job/metadata/Allocation.java
+++ b/elasticsearch/src/main/java/org/elasticsearch/xpack/prelert/job/metadata/Allocation.java
@@ -28,8 +28,6 @@ public class Allocation extends AbstractDiffable<Allocation> implements ToXConte
     public static final ParseField STATUS = new ParseField("status");
     public static final ParseField STATUS_REASON = new ParseField("status_reason");
 
-    static final Allocation PROTO = new Allocation(null, null, false, null, null);
-
     static final ObjectParser<Builder, ParseFieldMatcherSupplier> PARSER = new ObjectParser<>("allocation", Builder::new);
 
     static {
diff --git a/elasticsearch/src/main/java/org/elasticsearch/xpack/prelert/job/metadata/PrelertInitializationService.java b/elasticsearch/src/main/java/org/elasticsearch/xpack/prelert/job/metadata/PrelertInitializationService.java
index ff104b65af3..86aa73842b2 100644
--- a/elasticsearch/src/main/java/org/elasticsearch/xpack/prelert/job/metadata/PrelertInitializationService.java
+++ b/elasticsearch/src/main/java/org/elasticsearch/xpack/prelert/job/metadata/PrelertInitializationService.java
@@ -44,7 +44,7 @@ public class PrelertInitializationService extends AbstractComponent implements C
                         public ClusterState execute(ClusterState currentState) throws Exception {
                             ClusterState.Builder builder = new ClusterState.Builder(currentState);
                             MetaData.Builder metadataBuilder = MetaData.builder(currentState.metaData());
-                            metadataBuilder.putCustom(PrelertMetadata.TYPE, PrelertMetadata.PROTO);
+                            metadataBuilder.putCustom(PrelertMetadata.TYPE, PrelertMetadata.EMPTY_METADATA);
                             builder.metaData(metadataBuilder.build());
                             return builder.build();
                         }
diff --git a/elasticsearch/src/main/java/org/elasticsearch/xpack/prelert/job/metadata/PrelertMetadata.java b/elasticsearch/src/main/java/org/elasticsearch/xpack/prelert/job/metadata/PrelertMetadata.java
index 07190ad818e..812c73e5d06 100644
--- a/elasticsearch/src/main/java/org/elasticsearch/xpack/prelert/job/metadata/PrelertMetadata.java
+++ b/elasticsearch/src/main/java/org/elasticsearch/xpack/prelert/job/metadata/PrelertMetadata.java
@@ -47,8 +47,8 @@ public class PrelertMetadata implements MetaData.Custom {
     private static final ParseField SCHEDULERS_FIELD = new ParseField("schedulers");
 
     public static final String TYPE = "prelert";
-    public static final PrelertMetadata PROTO = new PrelertMetadata(Collections.emptySortedMap(), Collections.emptySortedMap(),
-            Collections.emptySortedMap());
+    public static final PrelertMetadata EMPTY_METADATA = new PrelertMetadata(Collections.emptySortedMap(),
+            Collections.emptySortedMap(), Collections.emptySortedMap());
 
     static final ObjectParser<Builder, ParseFieldMatcherSupplier> PRELERT_METADATA_PARSER = new ObjectParser<>("prelert_metadata",
             Builder::new);
diff --git a/elasticsearch/src/main/java/org/elasticsearch/xpack/prelert/scheduler/Scheduler.java b/elasticsearch/src/main/java/org/elasticsearch/xpack/prelert/scheduler/Scheduler.java
index d4e3e1d130d..9807d623272 100644
--- a/elasticsearch/src/main/java/org/elasticsearch/xpack/prelert/scheduler/Scheduler.java
+++ b/elasticsearch/src/main/java/org/elasticsearch/xpack/prelert/scheduler/Scheduler.java
@@ -23,8 +23,6 @@ public class Scheduler extends AbstractDiffable<Scheduler> implements ToXContent
     private static final ParseField CONFIG_FIELD = new ParseField("config");
     private static final ParseField STATUS_FIELD = new ParseField("status");
 
-    public static final Scheduler PROTO = new Scheduler(null, null);
-
     // Used for QueryPage
     public static final ParseField RESULTS_FIELD = new ParseField("schedulers");
 
diff --git a/elasticsearch/src/test/java/org/elasticsearch/xpack/prelert/job/manager/JobManagerTests.java b/elasticsearch/src/test/java/org/elasticsearch/xpack/prelert/job/manager/JobManagerTests.java
index 6545023d25e..0700316b345 100644
--- a/elasticsearch/src/test/java/org/elasticsearch/xpack/prelert/job/manager/JobManagerTests.java
+++ b/elasticsearch/src/test/java/org/elasticsearch/xpack/prelert/job/manager/JobManagerTests.java
@@ -165,7 +165,7 @@ public class JobManagerTests extends ESTestCase {
                 .fPut(AnomalyDetectorsIndex.jobResultsIndexName("my-special-place"), indexMetaData).build();
 
         ClusterState cs = ClusterState.builder(new ClusterName("_name"))
-                .metaData(MetaData.builder().putCustom(PrelertMetadata.TYPE, PrelertMetadata.PROTO).indices(indexMap)).build();
+                .metaData(MetaData.builder().putCustom(PrelertMetadata.TYPE, PrelertMetadata.EMPTY_METADATA).indices(indexMap)).build();
 
         doAnswer(invocationOnMock -> {
             AckedClusterStateUpdateTask<Boolean> task = (AckedClusterStateUpdateTask<Boolean>) invocationOnMock.getArguments()[1];
@@ -196,7 +196,7 @@ public class JobManagerTests extends ESTestCase {
 
     private ClusterState createClusterState() {
         ClusterState.Builder builder = ClusterState.builder(new ClusterName("_name"));
-        builder.metaData(MetaData.builder().putCustom(PrelertMetadata.TYPE, PrelertMetadata.PROTO));
+        builder.metaData(MetaData.builder().putCustom(PrelertMetadata.TYPE, PrelertMetadata.EMPTY_METADATA));
         return builder.build();
     }
 }