code: function buildDataImportPost (solrUrl, command, core) {
    const uniqueIdentifier = new Date().getTime()
    let clean = true
    if (command === 'delta-import') {
      clean = false
    }
    let url = solrUrl
    if (solrUrl[solrUrl.length - 1] !== '/') {
      url += '/'
    }
    return {
      url: `${url}${core}/dataimport?_=${uniqueIdentifier}&indent=off&wt=json`,
      form: {
        'clean': clean,
        'command': command,
        'commit': true,
        'core': core,
        'name': 'dataimport',
        'optimize': false,
        'verbose': false
      }
    }
  }
docs: class SolrService