public com.google.protobuf.ByteString getFileIdBytes() {
        java.lang.Object ref = fileId_;
        if (ref instanceof String) {
          com.google.protobuf.ByteString b =
              com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
          fileId_ = b;
          return b;
        } else {
          return (com.google.protobuf.ByteString) ref;
        }
      }
<pre>
Output only. The SharePoint file id. Output only.
</pre>

<code>string file_id = 9 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>

@return The bytes for fileId.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/SharePointSources.java