Search: Migrate to alternative search library

[wei2912]

We've been using Elastic Search UI for a while, but we're now running into the following limitations:

1. No infinite scroll support ([MPT-45] Mentors: Switch to single-page scroll #645)
2. Difficult to link to individual mentors (see [MPT-65] Attempt to create shareable link #731)
3. Customisation of Elastic Search queries

A possible alternative might be https://www.searchkit.co/, but more research needs to be done first.

[linear]

MPT-125 Search: Migrate to alternative search library

[dabby9734]

• searchkit seems to offer much of the same functionality of Elastic Search UI
  .
• There doesn't seem to be an easy way to implement infinite scroll (and it does not appear practical) due to reasons shared in [MPT-45] Mentors: Switch to single-page scroll #645
• The issue with linking to specific mentors seems to be related to Elastic Search UI performing its own transformations on the URL (which overwrites our extra query uid=...). While investigating the possibility of customising Elastic Search UI's transformation of URLs, I came across a NextJS Integration Guide. However, it's written for the NextJS Pages router, so I've been having some trouble adapting it to the App Router so that I can experiment with it using our setup.
• Need more elaboration on the 'customisation of Elastic Search queries'. What kind of customisation are we looking at?