added trim() to topic name to ensure the topic name matches the index name

Author: ravib777

src/main/java/com/splunk/kafka/connect/SplunkSinkConnectorConfig.java

@@ -527,7 +527,7 @@ private Map<String, Map<String, String>> initMetaMap(Map<String, String> taskCon
                     topicMeta.put(SOURCE, meta);
                 }
 
-                metaMap.put(topic, topicMeta);
+                metaMap.put(topic.trim(), topicMeta);
                 idx += 1;
             }
         }