code: public Observable<ServiceResponse<Page<JobExecutionInner>>> listByJobWithServiceResponseAsync(final String resourceGroupName, final String serverName, final String jobAgentName, final String jobName) {
          return listByJobSinglePageAsync(resourceGroupName, serverName, jobAgentName, jobName)
              .concatMap(new Func1<ServiceResponse<Page<JobExecutionInner>>, Observable<ServiceResponse<Page<JobExecutionInner>>>>() {
                  @Override
                  public Observable<ServiceResponse<Page<JobExecutionInner>>> call(ServiceResponse<Page<JobExecutionInner>> page) {
                      String nextPageLink = page.body().nextPageLink();
                      if (nextPageLink == null) {
                          return Observable.just(page);
                      }
                      return Observable.just(page).concatWith(listByJobNextWithServiceResponseAsync(nextPageLink));
                  }
              });
      }
docs: Lists a job's executions.
  
  @param resourceGroupName The name of the resource group that contains the resource. You can obtain this value from the Azure Resource Manager API or the portal.
  @param serverName The name of the server.
  @param jobAgentName The name of the job agent.
  @param jobName The name of the job to get.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;JobExecutionInner&gt; object