@Test
  public void testUpdateInstrument() throws Exception {
    // Arrange
    DataAcquisitionProject project = UnitTestCreateDomainObjectUtils.buildDataAcquisitionProject();
    this.dataAcquisitionProjectRepository.save(project);

    Instrument instrument =
        UnitTestCreateDomainObjectUtils.buildInstrument(project.getId(), "SurveyId");

    // Act and Assert
    // create the instrument with the given id
    mockMvc
        .perform(
            put(API_INSTRUMENTS_URI + "/" + instrument.getId())
                .content(TestUtil.convertObjectToJsonBytes(instrument)))
        .andExpect(status().isCreated());

    instrument.setTitle(new I18nString("Hurz2", "Hurz2"));

    // update the instrument with the given id
    mockMvc
        .perform(
            put(API_INSTRUMENTS_URI + "/" + instrument.getId())
                .content(TestUtil.convertObjectToJsonBytes(instrument)))
        .andExpect(status().is2xxSuccessful());

    // read the updated instrument and check the version
    mockMvc
        .perform(get(API_INSTRUMENTS_URI + "/" + instrument.getId() + "?projection=complete"))
        .andExpect(status().isOk())
        .andExpect(jsonPath("$.id", is(instrument.getId())))
        .andExpect(jsonPath("$.version", is(1)))
        .andExpect(jsonPath("$.title.de", is("Hurz2")));

    elasticsearchUpdateQueueService.processQueue();

    // check that there are two instrument documents
    elasticsearchAdminService.refreshAllIndices();
    assertThat(elasticsearchAdminService.countAllDocuments(), equalTo(2.0));
  }