Hello @Saurabh
Greetings of the day!!
Adding filters in the topic to limit data will indeed impact index creation, as Q creates a topic index only for the data that meets your filter criteria.
This means the index will be created only for the 2 years of data you’ve specified in your filter, not the entire 4 years.
Related links:
[1] How long it takes to index the dataset in topics?
[2] How to improve QuickSight Q topic indexing time