remove lines in cleanup mgr

Signed-off-by: Kiran Prakash <awskiran@amazon.com>

Author: kiranprakash154

server/src/main/java/org/opensearch/indices/IndicesRequestCache.java

@@ -492,7 +492,6 @@ class IndicesRequestCacheCleanupManager {
          * Enqueue cleanup key.
          *
          * @param cleanupKey the cleanup key
-         *
          */
         void enqueueCleanupKey(CleanupKey cleanupKey) {
             keysToClean.add(cleanupKey);
@@ -592,8 +591,6 @@ private void forceCleanCache() {
          * Cleans the cache based on the provided staleness threshold.
          * <p>If the percentage of stale keys in the cache is less than this threshold,the cache cleanup process is skipped.
          * @param threshold The staleness threshold as a double.
-         *
-         *
          */
         private void cleanCache(double threshold) {
             if (logger.isDebugEnabled()) {