Hi Susheel, Currently we have around 20M documents already and we are expecting now on that every month 1M of documents. The reason why don't want to for time based implicit routing is that, all documents will end up with recent shard and so indexing will be heavy for the new shard, where as older shards will be used just for query purpose. If we have default sharding, then load for indexing is distributed across all the shards. That's the reason we would like to stick to default sharding. But Join is the issue over here when default sharding is used :-(
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