[Apiman-user] Elastic search upgrade

Hello, I'm trying to gather metrics (using Kibana tool) from the ES instance that is being used by apiman. But what I found is the ES instance that is bundled inside the apiman is 1.7.x version which seems to be too old for current trending tools to index upon. Of course we can use old versions of those tools, for ex. Kibana 4.1.x version to index and gather metrics. But the older version are limited in functionality and I would like to use the latest if possible. Hence I have following options. 1) Use separate ElasticSearch instance with latest versions and update apiman.properties to point to this instance. And with this new version instance, I can use the latest tools. Question : Do you think the ES API 1.7.x is compatible and write indices to ES database running in latest version ? 2) Migrate the ES indices to new versions. But the below article, clearly says that the ES version must be at least 2.4.x for smooth migration using their migration tool. https://www.elastic.co/guide/en/elasticsearch/reference/current/reindex-u... 3) Upgrade bundled ES API 1.7.x to 5.2.x (latest version) or at least 2.4.x version I think it is practical to upgrade bundled ES version to 2.4.x at least (if not for latest 5.2.x) just to make it compatible for migrating indices easily. What are your thoughts? I'm happy to see any alternative options other than mentioned above. Thanks. regards Balu