Stash context to fetch resources from a system index

Signed-off-by: Darshit Chanpura <[email protected]>

src/main/java/org/opensearch/security/resources/ResourceSharingIndexHandler.java

@@ -1150,7 +1150,8 @@ public boolean deleteAllRecordsForUser(String name) {
     private <T> Set<T> getResourcesFromIds(Set<String> resourceIds, String resourceIndex, Class<T> clazz) {
 
         Set<T> result = new HashSet<>();
-        try {
+        // stashing Context to avoid permission issues in-case resourceIndex is a system index
+        try (ThreadContext.StoredContext ctx = this.threadPool.getThreadContext().stashContext()) {
             MultiGetRequest request = new MultiGetRequest();
             for (String id : resourceIds) {
                 request.add(new MultiGetRequest.Item(resourceIndex, id));