Search for Ghost

Another great integration for Ghost search would be Apache Solr, very powerful and open source. See e.g. Google chooses Solr for Public Service Website Search.

As a code example at GitHub, see the Solr integration for the NodeBB next-generation forums, wich are based on Node.js like Ghost.

There is also [Discussion] Solving Search in Ghost? · Issue #5321 · TryGhost/Ghost.