ES queries became very slow after upgrading from 7.11 to 7.13.2

Hi,
ES queries became very slow after upgrading from 7.11 to 7.13.2.

what can I do ? what changes made in 7.12 and 7.13 that may affect the performance ?

Thanks

Can you add some more details, what those queries consist of? If they contain aggregations, is the query fast again, when you omit those? If so, what aggregations does it contain?