diff --git a/x-pack/plugin/core/src/main/java/org/elasticsearch/protocol/xpack/migration/IndexUpgradeInfoResponse.java b/x-pack/plugin/core/src/main/java/org/elasticsearch/protocol/xpack/migration/IndexUpgradeInfoResponse.java
index 17115ac9b1711..d5769e419ce66 100644
--- a/x-pack/plugin/core/src/main/java/org/elasticsearch/protocol/xpack/migration/IndexUpgradeInfoResponse.java
+++ b/x-pack/plugin/core/src/main/java/org/elasticsearch/protocol/xpack/migration/IndexUpgradeInfoResponse.java
@@ -9,54 +9,18 @@
 import org.elasticsearch.common.ParseField;
 import org.elasticsearch.common.io.stream.StreamInput;
 import org.elasticsearch.common.io.stream.StreamOutput;
-import org.elasticsearch.common.xcontent.ConstructingObjectParser;
 import org.elasticsearch.common.xcontent.ToXContentObject;
 import org.elasticsearch.common.xcontent.XContentBuilder;
-import org.elasticsearch.common.xcontent.XContentParser;
 
 import java.io.IOException;
 import java.util.Map;
 import java.util.Objects;
-import java.util.stream.Collectors;
-
-import static org.elasticsearch.common.xcontent.ConstructingObjectParser.constructorArg;
 
 public class IndexUpgradeInfoResponse extends ActionResponse implements ToXContentObject {
 
     private static final ParseField INDICES = new ParseField("indices");
     private static final ParseField ACTION_REQUIRED = new ParseField("action_required");
 
-    private static final ConstructingObjectParser<IndexUpgradeInfoResponse, String> PARSER =
-        new ConstructingObjectParser<>("IndexUpgradeInfoResponse",
-            true,
-            (a, c) -> {
-            @SuppressWarnings("unchecked")
-                Map<String, Object> map = (Map<String, Object>)a[0];
-                Map<String, UpgradeActionRequired> actionsRequired = map.entrySet().stream()
-                    .filter(e -> {
-                        if (e.getValue() instanceof Map == false) {
-                            return false;
-                        }
-                        @SuppressWarnings("unchecked")
-                        Map<String, Object> value =(Map<String, Object>)e.getValue();
-                        return value.containsKey(ACTION_REQUIRED.getPreferredName());
-                    })
-                    .collect(Collectors.toMap(
-                        Map.Entry::getKey,
-                        e -> {
-                            @SuppressWarnings("unchecked")
-                            Map<String, Object> value = (Map<String, Object>) e.getValue();
-                            return UpgradeActionRequired.fromString((String)value.get(ACTION_REQUIRED.getPreferredName()));
-                        }
-                ));
-                return new IndexUpgradeInfoResponse(actionsRequired);
-            });
-
-    static {
-        PARSER.declareObject(constructorArg(), (p, c) -> p.map(), INDICES);
-    }
-
-
     private Map<String, UpgradeActionRequired> actions;
 
     public IndexUpgradeInfoResponse() {
@@ -113,8 +77,4 @@ public boolean equals(Object o) {
     public int hashCode() {
         return Objects.hash(actions);
     }
-
-    public static IndexUpgradeInfoResponse fromXContent(XContentParser parser) {
-        return PARSER.apply(parser, null);
-    }
 }
diff --git a/x-pack/plugin/core/src/test/java/org/elasticsearch/protocol/xpack/migration/IndexUpgradeInfoResponseTests.java b/x-pack/plugin/core/src/test/java/org/elasticsearch/protocol/xpack/migration/IndexUpgradeInfoResponseTests.java
index 76f00ebb24309..77ad986f0c355 100644
--- a/x-pack/plugin/core/src/test/java/org/elasticsearch/protocol/xpack/migration/IndexUpgradeInfoResponseTests.java
+++ b/x-pack/plugin/core/src/test/java/org/elasticsearch/protocol/xpack/migration/IndexUpgradeInfoResponseTests.java
@@ -8,7 +8,6 @@
 import org.elasticsearch.common.xcontent.XContentParser;
 import org.elasticsearch.protocol.AbstractHlrcStreamableXContentTestCase;
 
-import java.io.IOException;
 import java.util.AbstractMap;
 import java.util.HashMap;
 import java.util.Iterator;
@@ -19,12 +18,7 @@ public class IndexUpgradeInfoResponseTests extends
         AbstractHlrcStreamableXContentTestCase<IndexUpgradeInfoResponse, org.elasticsearch.client.migration.IndexUpgradeInfoResponse> {
 
     @Override
-    protected IndexUpgradeInfoResponse doParseInstance(XContentParser parser) {
-        return IndexUpgradeInfoResponse.fromXContent(parser);
-    }
-
-    @Override
-    public org.elasticsearch.client.migration.IndexUpgradeInfoResponse doHlrcParseInstance(XContentParser parser) throws IOException {
+    public org.elasticsearch.client.migration.IndexUpgradeInfoResponse doHlrcParseInstance(XContentParser parser) {
         return org.elasticsearch.client.migration.IndexUpgradeInfoResponse.fromXContent(parser);
     }