public java.lang.String getOperation() {
      java.lang.Object ref = operation_;
      if (!(ref instanceof java.lang.String)) {
        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
        java.lang.String s = bs.toStringUtf8();
        operation_ = s;
        return s;
      } else {
        return (java.lang.String) ref;
      }
    }
<pre>
Output only. The unique operation resource name.
Format: projects/{project}/locations/global/operations/{operation}.
</pre>

<code>string operation = 1 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>

@return The operation.
java-storagebatchoperations/proto-google-cloud-storagebatchoperations-v1/src/main/java/com/google/cloud/storagebatchoperations/v1/OperationMetadata.java