docToUpdate1.setId(null); // (should be unnecessary, _id shouldn't have been set)
docToUpdate2.setId(null);
docToUpdate2.setUpdateId(new ObjectId("5277fec1256f16a6d3def633")); // (Doesn't matter what it is, just check the diagnostic from StoreAndIndexManager.removeFromSearch matches)
toUpdate_feed.add(docToUpdate1);
toUpdate_feed.add(docToUpdate2);
pxControl_feed.processDocuments(InfiniteEnums.FEEDS, toAdd_feed, toUpdate_feed, toDelete_feed); // (add, update, delete)
// 2.1.3] Deleting some docs, adding others
// toDelete_feed.add(toAdd_feed.pop());
// pxControl_feed.processDocuments(InfiniteEnums.FEEDS, toAdd_feed, toUpdate_feed, toDelete_feed); // (add, update, delete)
// 2.1.4] More logic:
// DocumentPojo doc1 = null;