public static Builder newBuilder(com.google.cloud.tpu.v1.OperationMetadata prototype) {
    return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
  }
<pre>
API version.
</pre>

<code>string api_version = 7;</code>

@return The bytes for apiVersion.
java-tpu/proto-google-cloud-tpu-v1/src/main/java/com/google/cloud/tpu/v1/OperationMetadata.java