diff --git a/spi/src/main/java/org/opensearch/jobscheduler/spi/utils/LockService.java b/spi/src/main/java/org/opensearch/jobscheduler/spi/utils/LockService.java
index 4e75f525..19c5fb58 100644
--- a/spi/src/main/java/org/opensearch/jobscheduler/spi/utils/LockService.java
+++ b/spi/src/main/java/org/opensearch/jobscheduler/spi/utils/LockService.java
@@ -26,6 +26,7 @@
 import org.opensearch.client.Client;
 import org.opensearch.cluster.service.ClusterService;
 import org.opensearch.common.xcontent.LoggingDeprecationHandler;
+import org.opensearch.core.xcontent.MediaType;
 import org.opensearch.core.xcontent.NamedXContentRegistry;
 import org.opensearch.core.xcontent.ToXContent;
 import org.opensearch.common.xcontent.XContentFactory;
@@ -82,7 +83,10 @@ void createLockIndex(ActionListener<Boolean> listener) {
             if (lockIndexExist()) {
                 listener.onResponse(true);
             } else {
-                final CreateIndexRequest request = new CreateIndexRequest(LOCK_INDEX_NAME).mapping(lockMapping());
+                final CreateIndexRequest request = new CreateIndexRequest(LOCK_INDEX_NAME).mapping(
+                    lockMapping(),
+                    (MediaType) XContentType.JSON
+                );
                 client.admin()
                     .indices()
                     .create(request, ActionListener.wrap(response -> listener.onResponse(response.isAcknowledged()), exception -> {
diff --git a/src/main/java/org/opensearch/jobscheduler/utils/JobDetailsService.java b/src/main/java/org/opensearch/jobscheduler/utils/JobDetailsService.java
index 3af7cb3d..4a112e1e 100644
--- a/src/main/java/org/opensearch/jobscheduler/utils/JobDetailsService.java
+++ b/src/main/java/org/opensearch/jobscheduler/utils/JobDetailsService.java
@@ -30,6 +30,7 @@
 import org.opensearch.core.xcontent.XContentParser;
 import org.opensearch.common.xcontent.XContentType;
 import org.opensearch.extensions.action.ExtensionProxyAction;
+import org.opensearch.core.xcontent.MediaType;
 import org.opensearch.core.xcontent.NamedXContentRegistry;
 import org.opensearch.common.xcontent.LoggingDeprecationHandler;
 import org.opensearch.index.IndexNotFoundException;
@@ -293,7 +294,10 @@ void createJobDetailsIndex(ActionListener<Boolean> listener) {
         if (jobDetailsIndexExist()) {
             listener.onResponse(true);
         } else {
-            CreateIndexRequest request = new CreateIndexRequest(JOB_DETAILS_INDEX_NAME).mapping(jobDetailsMapping());
+            CreateIndexRequest request = new CreateIndexRequest(JOB_DETAILS_INDEX_NAME).mapping(
+                jobDetailsMapping(),
+                (MediaType) XContentType.JSON
+            );
             client.admin()
                 .indices()
                 .create(request, ActionListener.wrap(response -> listener.onResponse(response.isAcknowledged()), exception -> {