public static com.google.cloud.vertexai.api.VertexRagStore.RagResource parseFrom(
        java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws java.io.IOException {
      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
          PARSER, input, extensionRegistry);
    }
<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>

@param index The index of the value to return.
@return The bytes of the ragFileIds at the given index.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/VertexRagStore.java