bug: ai plugin uses the wrong key to decide whether to enable

[tzssangglass]

Current Behavior

1. apisix/apisix/plugins/ai.lua

   Lines 174 to 175 in f120076

   	elseif key == "filter_fun"then
   	route_flags["filter_fun"] = true

filter_fun should be filter_func

If filter_func is enabled on the route and other conditions are met for the ai plugin to be enabled, the route matches are cached instead of filter_func.

2. apisix/apisix/plugins/ai.lua

   Lines 215 to 216 in f120076

   	elseif k == "keepalive" then
   	route_up_flags["keepalive"] = true

keepalive should be keepalive_pool

This will cause the keepalive_pool configured in upstream to not take effect, using the default keepalive_pool configuration.

Expected Behavior

null

Error Logs

null

Steps to Reproduce

null

Environment

• APISIX version (run apisix version): master
• Operating system (run uname -a):
• OpenResty / Nginx version (run openresty -V or nginx -V):
• etcd version, if relevant (run curl http://127.0.0.1:9090/v1/server_info):
• APISIX Dashboard version, if relevant:
• Plugin runner version, for issues related to plugin runners:
• LuaRocks version, for installation issues (run luarocks --version):