add index and shard details in dropped message log

Signed-off-by: Varun Bharadwaj <varunbharadwaj1995@gmail.com>

Author: varunbharadwaj

server/src/main/java/org/opensearch/indices/pollingingest/MessageProcessorRunnable.java

@@ -393,7 +393,13 @@ private void logDroppedMessage(ShardUpdateMessage shardUpdateMessage) {
         String id = shardUpdateMessage.autoGeneratedIdTimestamp() == UNSET_AUTO_GENERATED_TIMESTAMP
             ? (String) shardUpdateMessage.parsedPayloadMap().get(ID)
             : "null";
-        logger.warn("Exhausted retries, dropping message: _id:{}, pointer:{}", id, shardUpdateMessage.pointer().asString());
+        logger.warn(
+            "Exhausted retries, dropping message: Index={}, Shard={}, _id:{}, pointer:{}",
+            indexName,
+            shardId,
+            id,
+            shardUpdateMessage.pointer().asString()
+        );
     }
 
     /**