Advanced search with offline indexer

[SeanDS]

Use an indexer like Apache Tika to build keywords from posts, attachments (including PDFs etc.) and other data. Store this data as meta values associated with the items (i.e. posts, attachments, etc.). Add custom search form to search against these items in a smart way, and/or include this meta in the standard search.

This will be a major feature requiring a lot of work. It will require the sysadmin to install and maintain a separate package, and a way for ALP to send/receive data to/from it.

Add a settings page to allow the admin to configure which extensions should be indexed (e.g. pdf, xls, rtf, etc.)

To avoid having a user account for the indexer to be able to see posts etc. on private sites, add an additional authentication mechanism such as token-based authentication.

Don't expect this feature quickly...

[SeanDS]

Basic example of Tika support: https://github.com/nanodust/masala/blob/master/masala.php

[SeanDS]

Useful new feature in WordPress 5.1: short circuit filters

[SeanDS]

Advanced search, but not offline indexing, implemented in c25c60f.