Cosmos: Allow vector and fulltext indexes on complex type scalar properties

[JoasE]

What problem are you trying to solve?

Cosmos allows defining vector and fulltext indexes via the IsVectorIndex and IsFullTextIndex extension methods on IndexBuilder.
Currently, EF doesn't support defining indexes on complex type scalar properties, and therefore we can't implement this for cosmos.

b.ComplexProperty(x => x.Nested, n => n.HasIndex(x => x.Id)); // HasIndex does not exist.

Related: #11336

Describe the solution you'd like

After indexing complex type scalar properties is added, add IsVectorIndex and IsFullTextIndex extension methods for complex type scalar properties

[roji]

Yeah, allowing indexes on complex types is something we have on the plan for 11 (#11336); this is similar to #29623 for JSON indexes on the SQL Server side.

I'll tentatively put this in 11.0 - @JoasE happy to have you work on this once @AndriySvyryd does #11336 (or if not we might be able to get around to it).

[JoasE]

@roji FYI, I'm only creating this as per #37919 (comment) , currently no plans for picking this up on my side

[roji]

Ah ok, no problem!