code: @BetaApi(
        "The surface for long-running operations is not stable yet and may change in the future.")
    public final OperationFuture<Instance, UpdateInstanceMetadata> partialUpdateInstanceAsync(
        PartialUpdateInstanceRequest request) {
      return partialUpdateInstanceOperationCallable().futureCall(request);
    }
docs: Partially updates an instance within a project.
  
  <p>Sample code:
  
  <pre><code>
  try (BaseBigtableInstanceAdminClient baseBigtableInstanceAdminClient = BaseBigtableInstanceAdminClient.create()) {
  Instance instance = Instance.newBuilder().build();
  FieldMask updateMask = FieldMask.newBuilder().build();
  PartialUpdateInstanceRequest request = PartialUpdateInstanceRequest.newBuilder()
  .setInstance(instance)
  .setUpdateMask(updateMask)
  .build();
  Instance response = baseBigtableInstanceAdminClient.partialUpdateInstanceAsync(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