Initial full-text search in ES|QL

[ChrisHegarty]

Meta issue listing tasks and subtasks for consideration as part of the Initial Search in ES|QL initiative.

• [x] Basic filtering: https://github.com/elastic/elasticsearch/pull/110132
• [ ] Basic search / ranking
• [ ] Rescoring / Reranking
• [ ] Custom Scoring
• [ ] Logical / physical plan limit
• [ ] Enable multi-node
• [ ] knn https://github.com/elastic/elasticsearch/pull/110054
• [ ] ..

relates #109518

POCs/discovery:

• [ ] options for full text support (fuzziness, analyzers, prefix_length etc)
• [ ] RRF
• [ ] semantic text support
• [ ] feature extraction
• [ ] inference service interaction

[elasticsearchmachine]

Pinging @elastic/es-search (Team:Search)

[ioanatia]

With https://github.com/elastic/elasticsearch/pull/110132 merged we should have the basic filtering case covered. I think it was the only piece that was missing. Let me know if there's something else needed, but I am marking that as completed.

[elasticsearchmachine]

Pinging @elastic/es-search-relevance (Team:Search Relevance)