Indexing lose data

My index pattern is index-*(eg.index-2019.11.17,index-2019.11.18),create index every day.But I find every day of 23:59:00 to next day 00:01:00,the index data will lose.

How are you indexing data? Are you determining this by looking at indexing rate in monitoring or based on the actual data that is indexed?

I see kibana hits is different from rows of log file a day.

I do not understand. How did you check this? Could logs be split across multiple indices?