public int getRagFileIdsCount() {
      return ragFileIds_.size();
    }
<pre>
Optional. rag_file_id. The files should be in the same rag_corpus set in
rag_corpus field.
</pre>

<code>repeated string rag_file_ids = 2 [(.google.api.field_behavior) = OPTIONAL];</code>

@return The count of ragFileIds.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/VertexRagStore.java