algoliasearch/src/offline/java/com/algolia/search/saas/MirroredIndex.java
public Request getObjectsOfflineAsync(@NonNull final List<String> objectIDs, @NonNull final CompletionHandler completionHandler) {
        return getObjectsOfflineAsync(objectIDs, null, completionHandler);
    }
public Request getObjectsOfflineAsync(@NonNull final List<String> objectIDs, @NonNull final CompletionHandler completionHandler) {
        return getObjectsOfflineAsync(objectIDs, null, completionHandler);
    }
Get individual objects, explicitly targeting the offline mirror, not the online API.

@param objectIDs Identifiers of objects to retrieve.
@param completionHandler The listener that will be notified of the request's outcome.
@return A cancellable request.
@throws IllegalStateException if mirroring is not activated on this index.