The problem is doing either FT.SEARCH or FT.AGGREGATE command on an index that contains 15999 documents and asking for an offset beyond 10000.
redis-cli output...
127.0.0.1:6380> FT.AGGREGATE rentals:default:idx:rentallisting:default @type:{_invalid|condo|apartment|bachelor|basement|studio|duplex|loft|house|town_house|multi_unit|cabin|cottage|room|private_room|shared_room} LOAD 1 @__key APPLY "@highlight_status_value * 100" AS rank SORTBY 4 @rank DESC @modified DESC LIMIT 9999 1
1) (integer) 15599
2) 1) "__key"
2) "rentals:default:doc:rentallisting:item:cmVudGFsbGlzdGluZzo1NjExNDY="
3) "highlight_status_value"
4) "0"
5) "rank"
6) "0"
7) "modified"
8) "1649256837.94"
127.0.0.1:6380> FT.AGGREGATE rentals:default:idx:rentallisting:default @type:{_invalid|condo|apartment|bachelor|basement|studio|duplex|loft|house|town_house|multi_unit|cabin|cottage|room|private_room|shared_room} LOAD 1 @__key APPLY "@highlight_status_value * 100" AS rank SORTBY 4 @rank DESC @modified DESC LIMIT 10000 1
1) (integer) 15599
127.0.0.1:6380> FT.AGGREGATE rentals:default:idx:rentallisting:default @type:{_invalid|condo|apartment|bachelor|basement|studio|duplex|loft|house|town_house|multi_unit|cabin|cottage|room|private_room|shared_room} LOAD 1 @__key APPLY "@highlight_status_value * 100" AS rank SORTBY 4 @rank DESC @modified DESC LIMIT 10001 1
(error) OFFSET exceeds maximum of 10000
127.0.0.1:6380>
Using docker image: docker.io/redis/redis-stack-server:6.2.0-v1
# Redis version=6.2.6, bits=64, commit=00000000, modified=0, pid=8, just started
* <search> RediSearch version 2.2.10 (Git=HEAD-3d0701f6)