Elasticsearch 6.0.0 GA released

The new sequence IDs are the most interesting things in this release I think. Having an officially supported cross datacenter replication strategy would be real nice.<p>Lots of folks will be mad, but removing multiple mapping types is a nice change too. It was a feature that never really made sense. Index-per-type was always the better strategy, even going back to the 0.23 days.<p>As others in this thread will no doubt point out though - the ES folks are moving awfully fast. I still support 1.7.5 clusters that will take heroic efforts to update. I&#x27;d love to use the new features on those clusters, but there simply isn&#x27;t a valid business case to take on the risk. This isn&#x27;t like small NPM packages that you can update on a whim - some of these systems require terabytes of re-indexing to upgrade :&#x2F;

My biggest gripe with the 6.0.0 GA is the removal of multiple mapping types per index. This creates a significant breaking change that will hurt the community tools adoption to 6.0. Their initial plan was to deprecate it and only remove it v7 onwards, which imho would&#x27;ve been a better balance.

I&#x27;m excited about the official Docker images now being available (again?) in an OSS flavor without X-Pack. Quote from <a href="https:&#x2F;&#x2F;www.elastic.co&#x2F;guide&#x2F;en&#x2F;elasticsearch&#x2F;reference&#x2F;6.0&#x2F;docker.html" rel="nofollow">https:&#x2F;&#x2F;www.elastic.co&#x2F;guide&#x2F;en&#x2F;elasticsearch&#x2F;reference&#x2F;6.0&#x2F;...</a> :<p>&gt; The images are available in three different configurations or &quot;flavors&quot;. The basic flavor, which is the default, ships with X-Pack Basic features pre-installed and automatically activated with a free licence. The platinum flavor features all X-Pack functionally under a 30-day trial licence. The oss flavor does not include X-Pack, and contains only open-source Elasticsearch.

I really wish they&#x27;d included the ElasticSearch SQL in 6.0, but I guess that feature still isn&#x27;t fully baked.<p>Even if it didn&#x27;t have the full power of the Elastic JSON Queries, for simple SELECT COUNT() ..GROUP BY, it would have been a nice addition...oh well, back to counting open and closed brackets...

In a large internal project we still make heavy use of Groovy for scripting. All scripting languages besides the new Painless language were deprecated in version 5, and now in version 6 they are removed. This hampers us in our migration efforts from 5 to 6. Does anyone know if it is still possible to use Groovy through a separate (third party) plugin? I played around a bit with Painless, but can&#x27;t say that I really like it. Documentation was&#x2F;is kind of poor, and it seemed to me it somewhat assumed familiarity with Java and it&#x27;s framework&#x2F;APIs.

Very much appreciate the improvements to handling docs with sparse fields!

Does Lucene 7.0 have a better story around G1 GC? ES has always warned against it, would love to see if that had changed

Off topic but how do you guys Unit Test Elastic Search queries? Do you start a full node and dump test data in it?<p>In case of SQL I can start an in memory sqllite and run my tests (Symfony PHP).

Not as exciting as Solr 7 release.