code: function moreLikeThisContent(data, callback) {
    var title = data.title;
    var content = data.content;
    // FIXME use all URIs
    var mlt = require('./moreLikeThis.js');
    content = utils.getTextFromHtml(content);
  
    mlt.fields = sourceFields;
    mlt.query.bool.should[0].mlt_field.content.like_text = content;
    mlt.query.bool.should[1].mlt_field.title.like_text = title;
    var query = JSON.stringify(mlt);
  
    doPost('/contentItem/_search', query, callback);
  }
docs: more like this field api