Hi Oleksiy, As Russel pointed out, 2i queries, including $bucket queries, are only supported when the backend supports ordered keys. This is currently not the case with bitcask.
It appears, though, that you have discovered a bug where the multi-backend module accepts the query despite the fact that the actually configured backend for the bucket(-type) cannot support the query. I'll make the engineering team aware of this. At this point in time I can only recommend that you do not use the $bucket query with your configuration and use an alternative, such as Solr-based search instead. Kind Regards, Magnus -- Magnus Kessler Client Services Engineer Basho Technologies Limited Registered Office - 8 Lincoln’s Inn Fields London WC2A 3BP Reg 07970431
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