Oxwall 1.7.4 beta is out today.
It contains a few bugfixes and a new platform search mechanism based on Zend Search Lucene engine that we first appled to our forum search feature. If it proves to have acceptable performance, we’ll extend it to other forms of text search in the software, including unified site search.
Also, forum gets advanced search mechanism long asked by avid forum users:

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With this release we continue to apply sprint development approach, so you can expect regular updates that will contain only those features that get finished by the feature cut-off dates. Currently we optimize our technical infrustructure and work at bigger features that will surface in Oxwall 1.8.
This beta release is aimed at beta testers, plugin developers and theme designers. Please make sure your items work with this beta and report any problems you find.
How to become an Oxwall beta tester: https://docs.oxwall.org/dev:store:beta-testers
ATTENTION: This is a beta release which is unsuitable for applying on live websites, hence we do not provide any update tools. Please, wait for the official release – it will show up as the update button in your admin area.
The official Oxwall 1.7.4 release is scheduled for June 2.
Thanks for creating with us!
Oxwall team