added basic example of fts and hs in whats new,

added small mention of hs in the vector section,
other minor cleanup

Author: maumar

entity-framework/core/providers/cosmos/full-text-search.md

@@ -73,9 +73,6 @@ You can also set a default language for the container - unless overridden in the
     }
 ```
 
-> [!NOTE]
-> Configuring the index is not mandatory, but it is recommended as it greatly improves performance of full-text search queries.
-
 ## Querying
 
 As part of the full-text search feature, Azure Cosmos DB introduced several built-in functions which allow for efficient querying of content inside the full-text search enabled properties. These functions are: [`FullTextContains`](/azure/cosmos-db/nosql/query/fulltextcontains), [`FullTextContainsAll`](/azure/cosmos-db/nosql/query/fulltextcontainsall), [`FullTextContainsAny`](/azure/cosmos-db/nosql/query/fulltextcontainsany), which look for specific keyword or keywords and [`FullTextScore`](/azure/cosmos-db/nosql/query/fulltextscore), which returns [BM25 score](https://en.wikipedia.org/wiki/Okapi_BM25) based on provided keywords.

entity-framework/core/providers/cosmos/vector-search.md

@@ -53,3 +53,9 @@ var blogs = await context.Blogs
 ```
 
 This will returns the top five Blogs, based on the similarity of their `Vector` property and the externally-provided `anotherVector` data.
+
+## Hybrid search
+
+Vector similarity search can be used with full-text search in the same query (i.e. hybrid search), by combining results of `VectorDistance` and `FullTextScore` functions using the [`RRF`](/azure/cosmos-db/nosql/query/rrf) (Reciprocal Rank Fusion) function. 
+
+See [documentation](xref:core/providers/cosmos/full-text-search?#hybrid-search) to learn how to enable full-text search support in EF model and how to use hybrid search in queries.

entity-framework/core/what-is-new/ef-core-10.0/whatsnew.md

@@ -26,7 +26,55 @@ EF10 requires the .NET 10 SDK to build and requires the .NET 10 runtime to run.
 ### Full-text search support
 
 Azure Cosmos DB now offers support for [full-text search](/azure/cosmos-db/gen-ai/full-text-search). It enables efficient and effective text searches, as well as evaluating the relevance of documents to a given search query. It can be used in combination with vector search to improve the accuracy of responses in some AI scenarios.
-EF Core 10 is adding support for this feature allowing for modeling the database with full-text search enabled properties and using full-text search functions inside queries targeting Azure Cosmos DB. See [documentation](xref:core/providers/cosmos/full-text-search) to learn how to take advantage of full-text search using EF Core.
+EF Core 10 is adding support for this feature allowing for modeling the database with full-text search enabled properties and using full-text search functions inside queries targeting Azure Cosmos DB.
+
+Here is a basic EF model configuration enabling full-text search on one of the properties:
+
+```c#
+public class Blog
+{
+    ...
+
+    public string Contents { get; set; }
+}
+
+public class BloggingContext
+{
+    ...
+
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<Blog>(b =>
+        {
+            b.Property(x => x.Contents).EnableFullTextSearch();
+            b.HasIndex(x => x.Contents).IsFullTextIndex();
+        });
+    }
+}
+```
+
+Once the model is configured, we can use full-text search operations in queries using methods provided in `EF.Functions`:
+
+```c#
+var cosmosBlogs = await context.Blogs.Where(x => EF.Functions.FullTextContains(x.Contents, "cosmos")).ToListAsync();
+```
+
+The following full-text operations are currently supported: [`FullTextContains`](/azure/cosmos-db/nosql/query/fulltextcontains), [`FullTextContainsAll`](/azure/cosmos-db/nosql/query/fulltextcontainsall), [`FullTextContainsAny`](/azure/cosmos-db/nosql/query/fulltextcontainsany), [`FullTextScore`](/azure/cosmos-db/nosql/query/fulltextscore).
+
+#### Hybrid search
+
+EF Core also supports [`RRF`](/azure/cosmos-db/nosql/query/rrf) (Reciprocal Rank Fusion) function, which combines vector similarity search and full-text search (i.e. hybrid search). Here is an example query using hybrid search:
+
+```c#
+float[] myVector = /* generate vector data from text, image, etc. */
+var hybrid = await context.Blogs.OrderBy(x => EF.Functions.Rrf(
+        EF.Functions.FullTextScore(x.Contents, "database"), 
+        EF.Functions.VectorDistance(x.Vector, myVector)))
+    .Take(10)
+    .ToListAsync();
+```
+
+See [documentation](xref:core/providers/cosmos/full-text-search) to learn more on how to use full-text search with EF Core.
 
 ### Vector similarity search exits preview