Exists API

It uses GetRequest just like the Get API. All of its optional arguments are supported. Since exists() only returns true or false, we recommend turning off fetching _source and any stored fields so the request is slightly lighter:

GetRequest getRequest = new GetRequest(
    "posts", 
    "doc",   
    "1");    
getRequest.fetchSourceContext(new FetchSourceContext(false)); 
getRequest.storedFields("_none_");                            

The asynchronous execution of exists request requires both the GetRequest instance and an ActionListener instance to be passed to the asynchronous method:

client.existsAsync(getRequest, listener); 

The asynchronous method does not block and returns immediately. Once it is completed the ActionListener is called back using the onResponse method if the execution successfully completed or using the onFailure method if it failed.

A typical listener for GetResponse looks like:

ActionListener<Boolean> listener = new ActionListener<Boolean>() {
    @Override
    public void onResponse(Boolean exists) {
        
    }

    @Override
    public void onFailure(Exception e) {
        
    }
};