diff --git a/rest-api-spec/src/main/resources/rest-api-spec/api/indices.create.json b/rest-api-spec/src/main/resources/rest-api-spec/api/indices.create.json
index 2b9e8617a661c..922183d628ac6 100644
--- a/rest-api-spec/src/main/resources/rest-api-spec/api/indices.create.json
+++ b/rest-api-spec/src/main/resources/rest-api-spec/api/indices.create.json
@@ -22,10 +22,6 @@
       ]
     },
     "params":{
-      "include_type_name":{
-        "type":"boolean",
-        "description":"Whether a type should be expected in the body of the mappings."
-      },
       "wait_for_active_shards":{
         "type":"string",
         "description":"Set the number of active shards to wait for before the operation returns."
diff --git a/rest-api-spec/src/main/resources/rest-api-spec/api/indices.get.json b/rest-api-spec/src/main/resources/rest-api-spec/api/indices.get.json
index f78b410f5b489..90a1274ecb059 100644
--- a/rest-api-spec/src/main/resources/rest-api-spec/api/indices.get.json
+++ b/rest-api-spec/src/main/resources/rest-api-spec/api/indices.get.json
@@ -22,10 +22,6 @@
       ]
     },
     "params":{
-      "include_type_name":{
-        "type":"boolean",
-        "description":"Whether to add the type name to the response (default: false)"
-      },
       "local":{
         "type":"boolean",
         "description":"Return local information, do not retrieve the state from master node (default: false)"
diff --git a/rest-api-spec/src/main/resources/rest-api-spec/api/indices.get_field_mapping.json b/rest-api-spec/src/main/resources/rest-api-spec/api/indices.get_field_mapping.json
index ee96dfcc21ccd..0e71b6d395777 100644
--- a/rest-api-spec/src/main/resources/rest-api-spec/api/indices.get_field_mapping.json
+++ b/rest-api-spec/src/main/resources/rest-api-spec/api/indices.get_field_mapping.json
@@ -38,10 +38,6 @@
       ]
     },
     "params":{
-      "include_type_name":{
-        "type":"boolean",
-        "description":"Whether a type should be returned in the body of the mappings."
-      },
       "include_defaults":{
         "type":"boolean",
         "description":"Whether the default mapping values should be returned as well"
diff --git a/rest-api-spec/src/main/resources/rest-api-spec/api/indices.get_template.json b/rest-api-spec/src/main/resources/rest-api-spec/api/indices.get_template.json
index 9e07ae663ff8f..337016763ad0a 100644
--- a/rest-api-spec/src/main/resources/rest-api-spec/api/indices.get_template.json
+++ b/rest-api-spec/src/main/resources/rest-api-spec/api/indices.get_template.json
@@ -28,10 +28,6 @@
       ]
     },
     "params":{
-      "include_type_name":{
-        "type":"boolean",
-        "description":"Whether a type should be returned in the body of the mappings."
-      },
       "flat_settings":{
         "type":"boolean",
         "description":"Return settings in flat format (default: false)"
diff --git a/rest-api-spec/src/main/resources/rest-api-spec/api/indices.put_template.json b/rest-api-spec/src/main/resources/rest-api-spec/api/indices.put_template.json
index 701a722d89eb8..75a328af929ef 100644
--- a/rest-api-spec/src/main/resources/rest-api-spec/api/indices.put_template.json
+++ b/rest-api-spec/src/main/resources/rest-api-spec/api/indices.put_template.json
@@ -23,10 +23,6 @@
       ]
     },
     "params":{
-      "include_type_name":{
-        "type":"boolean",
-        "description":"Whether a type should be returned in the body of the mappings."
-      },
       "order":{
         "type":"number",
         "description":"The order for this template when merging multiple matching ones (higher numbers are merged later, overriding the lower numbers)"
diff --git a/rest-api-spec/src/main/resources/rest-api-spec/api/indices.rollover.json b/rest-api-spec/src/main/resources/rest-api-spec/api/indices.rollover.json
index 4ed1f9b490969..fef1f03d1c9a7 100644
--- a/rest-api-spec/src/main/resources/rest-api-spec/api/indices.rollover.json
+++ b/rest-api-spec/src/main/resources/rest-api-spec/api/indices.rollover.json
@@ -38,10 +38,6 @@
       ]
     },
     "params":{
-      "include_type_name":{
-        "type":"boolean",
-        "description":"Whether a type should be included in the body of the mappings."
-      },
       "timeout":{
         "type":"time",
         "description":"Explicit operation timeout"
diff --git a/server/src/main/java/org/opensearch/rest/action/admin/indices/RestGetFieldMappingAction.java b/server/src/main/java/org/opensearch/rest/action/admin/indices/RestGetFieldMappingAction.java
index 292ed5e560848..d0610d790999b 100644
--- a/server/src/main/java/org/opensearch/rest/action/admin/indices/RestGetFieldMappingAction.java
+++ b/server/src/main/java/org/opensearch/rest/action/admin/indices/RestGetFieldMappingAction.java
@@ -60,7 +60,6 @@
 import static org.opensearch.rest.RestStatus.OK;
 
 public class RestGetFieldMappingAction extends BaseRestHandler {
-
     private static final Logger logger = LogManager.getLogger(RestGetFieldMappingAction.class);
     private static final DeprecationLogger deprecationLogger = DeprecationLogger.getLogger(logger.getName());
 
@@ -107,7 +106,7 @@ public RestResponse buildResponse(GetFieldMappingsResponse response, XContentBui
                         status = NOT_FOUND;
                     }
                     response.toXContent(builder, request);
-                    return new BytesRestResponse(RestStatus.OK, builder);
+                    return new BytesRestResponse(status, builder);
                 }
             });
     }