Feature Request: Far better search

[rwperrott]

The search as-is is pathetically primitive, because it seems to do any matching keyword search of all the downloaded docsets, and including a name: prefix is not enough search filtering, especially when it may be in any of a limited set of docsets e.g. any of multiple language related docsets! At the very least the search should allow use of logical expressions and allow limiting the search to one or a limited set of docsets, preferably named saveable set of docsets for later re-use, kind of like synaptic for Debian package searches.

A workaround could be to set up multiple Docset storage directories and switch between them, but would be a pain, and make installing new docsets, and keeping all docsets up-to-date, problematic.

[rwperrott]

Use of a better search engine, like https://lucene.apache.org/core/, which has implementations for other languages than just Java, may help to improve search a lot!