diff --git a/modules/ingest-common/src/main/java/org/elasticsearch/ingest/common/GrokProcessorGetAction.java b/modules/ingest-common/src/main/java/org/elasticsearch/ingest/common/GrokProcessorGetAction.java
index f57189b3523d2..cc46254a6c110 100644
--- a/modules/ingest-common/src/main/java/org/elasticsearch/ingest/common/GrokProcessorGetAction.java
+++ b/modules/ingest-common/src/main/java/org/elasticsearch/ingest/common/GrokProcessorGetAction.java
@@ -119,23 +119,29 @@ public void writeTo(StreamOutput out) throws IOException {
 
     public static class TransportAction extends HandledTransportAction<Request, Response> {
 
+        private final Map<String, String> grokPatterns;
+        private final Map<String, String> sortedGrokPatterns;
+
         @Inject
         public TransportAction(TransportService transportService, ActionFilters actionFilters) {
+            this(transportService, actionFilters, GROK_PATTERNS);
+        }
+
+        // visible for testing
+        TransportAction(TransportService transportService, ActionFilters actionFilters, Map<String, String> grokPatterns) {
             super(NAME, transportService, actionFilters, Request::new);
+            this.grokPatterns = grokPatterns;
+            this.sortedGrokPatterns = new TreeMap<>(this.grokPatterns);
         }
 
         @Override
         protected void doExecute(Task task, Request request, ActionListener<Response> listener) {
             try {
-                listener.onResponse(new Response(getGrokPatternsResponse(GROK_PATTERNS, request.sorted())));
+                listener.onResponse(new Response(request.sorted() ? sortedGrokPatterns : grokPatterns));
             } catch (Exception e) {
                 listener.onFailure(e);
             }
         }
-
-        static Map<String, String> getGrokPatternsResponse(Map<String, String> patterns, boolean sorted) {
-            return sorted ? new TreeMap<>(patterns) : patterns;
-        }
     }
 
     public static class RestAction extends BaseRestHandler {
diff --git a/modules/ingest-common/src/test/java/org/elasticsearch/ingest/common/GrokProcessorGetActionTests.java b/modules/ingest-common/src/test/java/org/elasticsearch/ingest/common/GrokProcessorGetActionTests.java
index 0a657aae16e32..9e0e00b717b80 100644
--- a/modules/ingest-common/src/test/java/org/elasticsearch/ingest/common/GrokProcessorGetActionTests.java
+++ b/modules/ingest-common/src/test/java/org/elasticsearch/ingest/common/GrokProcessorGetActionTests.java
@@ -19,6 +19,8 @@
 
 package org.elasticsearch.ingest.common;
 
+import org.elasticsearch.action.ActionListener;
+import org.elasticsearch.action.support.ActionFilters;
 import org.elasticsearch.common.bytes.BytesReference;
 import org.elasticsearch.common.io.stream.BytesStreamOutput;
 import org.elasticsearch.common.io.stream.StreamInput;
@@ -27,14 +29,19 @@
 import org.elasticsearch.common.xcontent.XContentHelper;
 import org.elasticsearch.common.xcontent.json.JsonXContent;
 import org.elasticsearch.test.ESTestCase;
+import org.elasticsearch.transport.TransportService;
 
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 
+import static org.hamcrest.CoreMatchers.not;
 import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.sameInstance;
+import static org.hamcrest.core.IsNull.notNullValue;
 import static org.hamcrest.core.IsNull.nullValue;
+import static org.mockito.Mockito.mock;
 
 public class GrokProcessorGetActionTests extends ESTestCase {
     private static final Map<String, String> TEST_PATTERNS = Map.of("PATTERN2", "foo2", "PATTERN1", "foo1");
@@ -59,10 +66,40 @@ public void testResponseSerialization() throws Exception {
     }
 
     public void testResponseSorting() {
-        Map<String, String> sorted = GrokProcessorGetAction.TransportAction.getGrokPatternsResponse(TEST_PATTERNS, true);
         List<String> sortedKeys = new ArrayList<>(TEST_PATTERNS.keySet());
         Collections.sort(sortedKeys);
-        assertThat(new ArrayList<>(sorted.keySet()), equalTo(sortedKeys));
+        GrokProcessorGetAction.TransportAction transportAction =
+            new GrokProcessorGetAction.TransportAction(mock(TransportService.class), mock(ActionFilters.class), TEST_PATTERNS);
+        GrokProcessorGetAction.Response[] receivedResponse = new GrokProcessorGetAction.Response[1];
+        transportAction.doExecute(null, new GrokProcessorGetAction.Request(true), new ActionListener<>() {
+            @Override
+            public void onResponse(GrokProcessorGetAction.Response response) {
+                receivedResponse[0] = response;
+            }
+
+            @Override
+            public void onFailure(Exception e) {
+                fail();
+            }
+        });
+        assertThat(receivedResponse[0], notNullValue());
+        assertThat(receivedResponse[0].getGrokPatterns().keySet().toArray(), equalTo(sortedKeys.toArray()));
+
+        GrokProcessorGetAction.Response firstResponse = receivedResponse[0];
+        transportAction.doExecute(null, new GrokProcessorGetAction.Request(true), new ActionListener<>() {
+            @Override
+            public void onResponse(GrokProcessorGetAction.Response response) {
+                receivedResponse[0] = response;
+            }
+
+            @Override
+            public void onFailure(Exception e) {
+                fail();
+            }
+        });
+        assertThat(receivedResponse[0], notNullValue());
+        assertThat(receivedResponse[0], not(sameInstance(firstResponse)));
+        assertThat(receivedResponse[0].getGrokPatterns(), sameInstance(firstResponse.getGrokPatterns()));
     }
 
     @SuppressWarnings("unchecked")