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diff --git a/core/src/test/java/org/elasticsearch/rest/RestControllerTests.java b/core/src/test/java/org/elasticsearch/rest/RestControllerTests.java
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+++ b/core/src/test/java/org/elasticsearch/rest/RestControllerTests.java
@@ -0,0 +1,99 @@
+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.elasticsearch.rest;
+
+import org.elasticsearch.common.settings.Settings;
+import org.elasticsearch.common.util.concurrent.ThreadContext;
+import org.elasticsearch.test.ESTestCase;
+import org.elasticsearch.test.rest.FakeRestRequest;
+
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+
+import static org.hamcrest.CoreMatchers.equalTo;
+
+public class RestControllerTests extends ESTestCase {
+
+    public void testRegisterRelevantHeaders() throws InterruptedException {
+
+        final RestController restController = new RestController(Settings.EMPTY);
+
+        int iterations = randomIntBetween(1, 5);
+
+        Set<String> headers = new HashSet<>();
+        ExecutorService executorService = Executors.newFixedThreadPool(iterations);
+        for (int i = 0; i < iterations; i++) {
+            int headersCount = randomInt(10);
+            final Set<String> newHeaders = new HashSet<>();
+            for (int j = 0; j < headersCount; j++) {
+                String usefulHeader = randomRealisticUnicodeOfLengthBetween(1, 30);
+                newHeaders.add(usefulHeader);
+            }
+            headers.addAll(newHeaders);
+
+            executorService.submit((Runnable) () -> restController.registerRelevantHeaders(newHeaders.toArray(new String[newHeaders.size()])));
+        }
+
+        executorService.shutdown();
+        assertThat(executorService.awaitTermination(1, TimeUnit.SECONDS), equalTo(true));
+        String[] relevantHeaders = restController.relevantHeaders().toArray(new String[restController.relevantHeaders().size()]);
+        assertThat(relevantHeaders.length, equalTo(headers.size()));
+
+        Arrays.sort(relevantHeaders);
+        String[] headersArray = new String[headers.size()];
+        headersArray = headers.toArray(headersArray);
+        Arrays.sort(headersArray);
+        assertThat(relevantHeaders, equalTo(headersArray));
+    }
+
+    public void testApplyRelevantHeaders() {
+        final ThreadContext threadContext = new ThreadContext(Settings.EMPTY);
+        final RestController restController = new RestController(Settings.EMPTY) {
+            @Override
+            boolean checkRequestParameters(RestRequest request, RestChannel channel) {
+                return true;
+            }
+
+            @Override
+            void executeHandler(RestRequest request, RestChannel channel) throws Exception {
+                assertEquals("true", threadContext.getHeader("header.1"));
+                assertEquals("true", threadContext.getHeader("header.2"));
+                assertNull(threadContext.getHeader("header.3"));
+
+            }
+        };
+        threadContext.putHeader("header.3", "true");
+        restController.registerRelevantHeaders("header.1", "header.2");
+        Map<String, String> restHeaders = new HashMap<>();
+        restHeaders.put("header.1", "true");
+        restHeaders.put("header.2", "true");
+        restHeaders.put("header.3", "false");
+        restController.dispatchRequest(new FakeRestRequest(restHeaders), null, threadContext);
+        assertNull(threadContext.getHeader("header.1"));
+        assertNull(threadContext.getHeader("header.2"));
+        assertEquals("true", threadContext.getHeader("header.3"));
+    }
+}