At the moment, Metron currently ships with Solr 6.6.2 support (I think that matches HDP Search 3). Horton Works HDP Search 4 and 5 is based off Apache Solr 7.4 Cloudera search is based off Apache Solr 7.4 as well. Lucidworks Solr is based on 7.x, soon to be 8.x (if not already) - they always seem to push the bleeding edge with SOLR in production.
Does anybody have any issues if I upgrade the bundled SOLR support to Solr 7.4? I'm hoping most people that use Metron/Solr in production use a supported distribution, and thus we should try and keep up with the supported Solr versions as much as possible. Regards, Dale.
