Full-text search is now supported in EF10 using the fluent API for configuration:
.EnableFullTextSearch() // on properties
.IsFullTextIndex() // on indexes
and then can be searched with
.Where(x => EF.Functions.FullTextCpontains(x.Property, "sometext")
It also supports FullTextContainsAll, FullTextContainsAny and FullTextScore.
https://learn.microsoft.com/en-us/ef/core/what-is-new/ef-core-10.0/whatsnew