I have an index with approximately 2.3M documents.
It usually returns results of query within 1~2 seconds, but it gets very slow (sometimes as long as 20~30s) while I'm inserting data into the index.
I insert data in RDB into the index in a batch process using Bulk API (about 100 documents per second).
Why does this happen?
I could not find any documentations about the behavior.