How to test a service which uses RestHighLevelClient?

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Hi, I have a service which uses RestHighLevelClient and which I want to unit test. I have a method that has the following lines:

 ....
    IndexRequest request = new IndexRequest(index, type).source(getContentBuilder(update));
    IndexResponse response = restHighLevelClient.index(request);
    return response.getResult() == CREATED;
....

So, in my test I'm trying to do the following:

@Mock
RestHighLevelClient esClient = Mockito.mock(RestHighLevelClient.class);
@InjectMocks
MyService updateService;

And directly in the test:

when(esClient.index(any(IndexRequest.class)))
          .thenReturn(new IndexResponse());

But I get the NullPointerExeption in this line.

I found information that we cannot mock RestHighLevelClient. I would like to get more details about it. So, is it possible to test my method using something like that?

Thanks in advance

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