code: @BetaApi
    public final Operation patchHttpHealthCheck(
        ProjectGlobalHttpHealthCheckName httpHealthCheck,
        HttpHealthCheck2 httpHealthCheckResource,
        List<String> fieldMask) {
  
      PatchHttpHealthCheckHttpRequest request =
          PatchHttpHealthCheckHttpRequest.newBuilder()
              .setHttpHealthCheck(httpHealthCheck == null ? null : httpHealthCheck.toString())
              .setHttpHealthCheckResource(httpHealthCheckResource)
              .addAllFieldMask(fieldMask)
              .build();
      return patchHttpHealthCheck(request);
    }
docs: Updates a HttpHealthCheck resource in the specified project using the data included in the
  request. This method supports PATCH semantics and uses the JSON merge patch format and
  processing rules.
  
  <p>Sample code:
  
  <pre><code>
  try (HttpHealthCheckClient httpHealthCheckClient = HttpHealthCheckClient.create()) {
  ProjectGlobalHttpHealthCheckName httpHealthCheck = ProjectGlobalHttpHealthCheckName.of("[PROJECT]", "[HTTP_HEALTH_CHECK]");
  HttpHealthCheck2 httpHealthCheckResource = HttpHealthCheck2.newBuilder().build();
  List&lt;String&gt; fieldMask = new ArrayList&lt;&gt;();
  Operation response = httpHealthCheckClient.patchHttpHealthCheck(httpHealthCheck, httpHealthCheckResource, fieldMask);
  }
  </code></pre>
  
  @param httpHealthCheck Name of the HttpHealthCheck resource to patch.
  @param httpHealthCheckResource An HttpHealthCheck resource. This resource defines a template
  for how individual instances should be checked for health, via HTTP.
  @param fieldMask The fields that should be serialized (even if they have empty values). If the
  containing message object has a non-null fieldmask, then all the fields in the field mask
  (and only those fields in the field mask) will be serialized. If the containing object does
  not have a fieldmask, then only non-empty fields will be serialized.
  @throws com.google.api.gax.rpc.ApiException if the remote call fails