The browseObjects method get all records from an index. You can use the browse method to retrieve all records from an index without pagination. You might use this to export your index for backup purposes. To export all records, use an empty query.
The browseObjects method uses the browseFrom method under the hood. Using the browseFrom method directly would likely involve building your own version of browseObjects in order for it to be useful.
You may use the following method to get all records from your index:
for (AlgoliaIndexingObject object : index.browseObjects(new BrowseIndexQuery())) {
2 // save 'object' somewhere (DB, File..)
3}