code: @BetaApi(
        "The surface for long-running operations is not stable yet and may change in the future.")
    public final OperationFuture<Empty, OperationMetadata> deleteInstanceAsync(
        DeleteInstanceRequest request) {
      return deleteInstanceOperationCallable().futureCall(request);
    }
docs: Deletes a specific Redis instance. Instance stops serving and data is deleted.
  
  <p>Sample code:
  
  <pre><code>
  try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
  InstanceName name = InstanceName.of("[PROJECT]", "[LOCATION]", "[INSTANCE]");
  DeleteInstanceRequest request = DeleteInstanceRequest.newBuilder()
  .setName(name.toString())
  .build();
  cloudRedisClient.deleteInstanceAsync(request).get();
  }
  </code></pre>
  
  @param request The request object containing all of the parameters for the API call.
  @throws com.google.api.gax.rpc.ApiException if the remote call fails