Incorrect number of seconds in a day

[Pikamander2]

Hi there, I used a code search and found an incorrect number of seconds in a day (84600 instead of 86400) listed in one of your files. I recommend fixing it to avoid incorrect timings that could potentially lead to unexpected behavior.

https://github.com/Yelp/elastalert/blob/e0bbcb5b71e9fdb4a750c3871d365a882ff17b16/docs/source/ruletypes.rst#L2082?plain=1#L441