diff --git a/server/src/main/java/org/opensearch/common/util/concurrent/ThreadContext.java b/server/src/main/java/org/opensearch/common/util/concurrent/ThreadContext.java
index b9c7177da828b..906a27e9f398c 100644
--- a/server/src/main/java/org/opensearch/common/util/concurrent/ThreadContext.java
+++ b/server/src/main/java/org/opensearch/common/util/concurrent/ThreadContext.java
@@ -480,7 +480,7 @@ public <T> T getTransient(String key) {
      * @param value       the header value
      */
     public void addResponseHeader(final String key, final String value) {
-        updateResponseHeader(key, value, v -> v, false);
+        addResponseHeader(key, value, v -> v);
     }
 
     /**
@@ -490,7 +490,19 @@ public void addResponseHeader(final String key, final String value) {
      * @param value       the header value
      */
     public void updateResponseHeader(final String key, final String value) {
-        updateResponseHeader(key, value, v -> v, true);
+        updateResponseHeader(key, value, v -> v);
+    }
+
+    /**
+     * Add the {@code value} for the specified {@code key} with the specified {@code uniqueValue} used for de-duplication. Any duplicate
+     * {@code value} after applying {@code uniqueValue} is ignored.
+     *
+     * @param key         the header name
+     * @param value       the header value
+     * @param uniqueValue the function that produces de-duplication values
+     */
+    public void addResponseHeader(final String key, final String value, final Function<String, String> uniqueValue) {
+        threadLocal.set(threadLocal.get().putResponse(key, value, uniqueValue, maxWarningHeaderCount, maxWarningHeaderSize, false));
     }
 
     /**
@@ -500,17 +512,9 @@ public void updateResponseHeader(final String key, final String value) {
      * @param key         the header name
      * @param value       the header value
      * @param uniqueValue the function that produces de-duplication values
-     * @param replaceExistingKey whether to replace the existing header if it already exists
-     */
-    public void updateResponseHeader(
-        final String key,
-        final String value,
-        final Function<String, String> uniqueValue,
-        final boolean replaceExistingKey
-    ) {
-        threadLocal.set(
-            threadLocal.get().putResponse(key, value, uniqueValue, maxWarningHeaderCount, maxWarningHeaderSize, replaceExistingKey)
-        );
+     */
+    public void updateResponseHeader(final String key, final String value, final Function<String, String> uniqueValue) {
+        threadLocal.set(threadLocal.get().putResponse(key, value, uniqueValue, maxWarningHeaderCount, maxWarningHeaderSize, true));
     }
 
     /**
diff --git a/server/src/test/java/org/opensearch/common/util/concurrent/ThreadContextTests.java b/server/src/test/java/org/opensearch/common/util/concurrent/ThreadContextTests.java
index e6d07c5630541..4e66575711046 100644
--- a/server/src/test/java/org/opensearch/common/util/concurrent/ThreadContextTests.java
+++ b/server/src/test/java/org/opensearch/common/util/concurrent/ThreadContextTests.java
@@ -344,16 +344,11 @@ public void testResponseHeaders() {
         }
 
         final String value = HeaderWarning.formatWarning("qux");
-        threadContext.updateResponseHeader("baz", value, s -> HeaderWarning.extractWarningValueFromWarningHeader(s, false), false);
+        threadContext.updateResponseHeader("baz", value, s -> HeaderWarning.extractWarningValueFromWarningHeader(s, false));
         // pretend that another thread created the same response at a different time
         if (randomBoolean()) {
             final String duplicateValue = HeaderWarning.formatWarning("qux");
-            threadContext.updateResponseHeader(
-                "baz",
-                duplicateValue,
-                s -> HeaderWarning.extractWarningValueFromWarningHeader(s, false),
-                false
-            );
+            threadContext.updateResponseHeader("baz", duplicateValue, s -> HeaderWarning.extractWarningValueFromWarningHeader(s, false));
         }
 
         threadContext.addResponseHeader("Warning", "One is the loneliest number");