Best way to do time sort

[aravinth thangasami]

I am indexing a time field. I need to get the latest results and my index
contains millions of documents with frequent updates almost 90% of the
index updates.


option 1:

To index the time as string

option 2:

To index the time field as Number

option 3:

To index the time field as DocValue


Which option will be the best approach ??


Thanks
Aravinth