code: @BetaApi
    public final Instance getInstance(String instance) {
  
      GetInstanceHttpRequest request =
          GetInstanceHttpRequest.newBuilder().setInstance(instance).build();
      return getInstance(request);
    }
docs: Returns the specified Instance resource. Gets a list of available instances by making a list()
  request.
  
  <p>Sample code:
  
  <pre><code>
  try (InstanceClient instanceClient = InstanceClient.create()) {
  ProjectZoneInstanceName instance = ProjectZoneInstanceName.of("[PROJECT]", "[ZONE]", "[INSTANCE]");
  Instance response = instanceClient.getInstance(instance.toString());
  }
  </code></pre>
  
  @param instance Name of the instance resource to return.
  @throws com.google.api.gax.rpc.ApiException if the remote call fails