Change vector index terminology in documentation

Updated terminology from 'FTS vector index' to 'Search Vector Index' for clarity.

Author: SanjanaBoggaramJ

tutorial/markdown/java/spring-ai.md

@@ -160,10 +160,10 @@ The application uses `CouchbaseSearchVectorStore`, which:
 - Maintains metadata alongside vector embeddings
 
 ### Vector Index
-The embedding store uses an FTS vector index in order to perform vector similarity lookups. If provided with a name for
+The embedding store uses an Search Vector Index in order to perform vector similarity lookups. If provided with a name for
 vector index that does not exist on the cluster, the store will attempt to create a new index with default
 configuration based on the provided initialization settings. It is recommended to manually review the settings for the
-created index and adjust them according to specific use cases. More information about vector search and FTS index 
+created index and adjust them according to specific use cases. More information about Search Vector Index 
 configuration can be found at [Couchbase Documentation](https://docs.couchbase.com/server/current/vector-search/vector-search.html).
 
 ### Controller Class (`Controller.java`)
@@ -227,4 +227,4 @@ In order to run this application, use the following command:
 - [Spring AI Documentation](https://docs.spring.io/spring-ai/reference/index.html)
 - [Couchbase Vector Search](https://docs.couchbase.com/server/current/fts/vector-search.html)
 - [OpenAI Embeddings Documentation](https://platform.openai.com/docs/guides/embeddings)
-- [Spring Boot Documentation](https://docs.spring.io/spring-boot/docs/current/reference/html/)
+- [Spring Boot Documentation](https://docs.spring.io/spring-boot/docs/current/reference/html/)