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This page describes changes introduced in MongoDB 6.3 that can affect compatibility with older versions of MongoDB.
The following changes to time series collections can affect compatibility with older versions of MongoDB.
Starting in MongoDB 6.3, you can configure time series bucket
granularity using the new
bucketRoundingSeconds custom bucketing parameters. To downgrade
below 6.3, you must either drop all collections with these parameters,
or modify them to use the corresponding
granularity. For details,
correspond to a
granularity value. In such cases, you must drop the
Starting in MongoDB 6.3, you can create partial Time To Live (TTL) indexes on time series collections. To downgrade below 6.3, you must remove all partial TTL indexes from your time series collections.