How to delete _sync:rb documents

In one of the buckets, we have 23K documents and in addition to that, there are 2.7 million _sync:rb documents.
For each document, there are around 138 _sync:rb documents.
Whenever a document is updated from a mobile device, the Account_xxxxxx document has correct data and the conflict resolution is working fine as we are not seeing any data loss.
Is there a way to remove these _sync:rb documents as it is slowing down all our queries?
We are getting timeout on most of our queries due to the high volume of _sync:rb documents.

see What are "_sync:rb" documents?

mreiche,

Whenever we modify a document, a copy of it is created.

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    "rev": "142-171df75ef38600000000000002000006",
    "expiration": 0,
    "flags": 33554438,
    "type": "json"
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