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Is there documentation for rolling your own?

I've been considering building my own search engine for a while for my niche topic which has <50 websites and blogs on the web.

I can't tell how useful this will be but it'd be fun to give it a go.

Your own what? Your own query? Sure; it's just a SPARQL query over the Wikidata data model. The documentation portal for the query service is at https://www.wikidata.org/wiki/Wikidata:SPARQL_query_service/... though you'd need some familiarity with Wikidata, its properties, etc. E.g. the "wdt:P856" in my query is the "official website" property on Wikidata: https://m.wikidata.org/wiki/Property:P856

Elastic App Search would be well suited for something like that. It comes with a built in crawler.