Nanosecond timestamp support
I've put this under the time series category since that's where it's most applicable, but it's really a data model / BSON issue.
The topic of higher resolution timestamps have been surfaced from time to time for at least a decade (https://jira.mongodb.org/browse/SERVER-1460), and usually prompts a response like "just use integers". With the addition of time series collections however, where the concept of time is integral to database functionality, I think it's time to reconsider adding a type with at least nanosecond precision timestamp support. Date's millisecond resolution is woefully inadequate for a number of relevant use cases, be it sensor data, financial data, log data, etc.
As per the link below these are stored with millisecond precision
BSON Date is a 64-bit integer that represents the number of milliseconds since the Unix epoch (Jan 1, 1970). This results in a representable date range of about 290 million years into the past and future.
However for java.time.LocalDateTime , it is stored to nano second precision.
Time is represented to nanosecond precision. For example, the value "2nd October 2007 at 13:45.30.123456789" can be stored in a LocalDateTime.
Therefore we are not able to store the LocalDateTime as BSON Date type in Mongo and therefore we can not query using the LocalDateTime.
The current workaround which we currently doing is to store them as String and deserialising them as LocalDateTime, however we can not query using the LocalDateTime.