A GetRollupJobRequest can be built without any parameters to get all of the rollup jobs or with a job name to get a single job:

GetRollupJobRequest getAll = new GetRollupJobRequest();        
GetRollupJobRequest getJob = new GetRollupJobRequest("job_1"); 

The Get Rollup Job API can be executed through a RollupClient instance. Such instance can be retrieved from a RestHighLevelClient using the rollup() method:

GetRollupJobResponse response = client.rollup().getRollupJob(getJob, RequestOptions.DEFAULT);

The returned GetRollupJobResponse includes a JobWrapper per returned job which contains the configuration of the job, the job’s current status, and statistics about the job’s past execution.

assertThat(response.getJobs(), hasSize(1));
JobWrapper job = response.getJobs().get(0); 
RollupJobConfig config = job.getJob();
RollupJobStatus status = job.getStatus();
RollupIndexerJobStats stats = job.getStats();

This request can be executed asynchronously:

client.rollup().getRollupJobAsync(getJob, RequestOptions.DEFAULT, 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 GetRollupJobResponse looks like:

ActionListener<GetRollupJobResponse> listener = new ActionListener<GetRollupJobResponse>() {
    @Override
    public void onResponse(GetRollupJobResponse response) {
        
    }

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