lib/implementation.js
function replaceIdsRecursively(doc) {
                _.each(doc, function(val, key) {
                  if (key === 'workflowGuidAndLocaleDuplicates') {
                  // Do not alter ids inside the historical archive of
                  // the original orphaned docs. -Tom
                    return;
                  }
                  if ((typeof (val) === 'string') && (val.length < 100)) {
                    if (idsToNew[val]) {
                      self.apos.utils.warn('Correcting ' + doc[key] + ' to ' + idsToNew[val] + ' in join');
                      doc[key] = idsToNew[val];
                      modified = true;
                    }
                  } else if (val && (typeof (val) === 'object')) {
                    replaceIdsRecursively(val);
                  }
                });
              }
function replaceIdsRecursively(doc) {
                _.each(doc, function(val, key) {
                  if (key === 'workflowGuidAndLocaleDuplicates') {
                  // Do not alter ids inside the historical archive of
                  // the original orphaned docs. -Tom
                    return;
                  }
                  if ((typeof (val) === 'string') && (val.length < 100)) {
                    if (idsToNew[val]) {
                      self.apos.utils.warn('Correcting ' + doc[key] + ' to ' + idsToNew[val] + ' in join');
                      doc[key] = idsToNew[val];
                      modified = true;
                    }
                  } else if (val && (typeof (val) === 'object')) {
                    replaceIdsRecursively(val);
                  }
                });
              }
Recursively replace all occurrences of the ids in this locale found in the given doc with their new ids per `idsToNew`. This prevents _id conflicts on insert, even though old data is still in the database under other locale names