Add doc note regarding processors bound
Add doc note regarding processors bound

This commit expands the thread pool docs regarding the processor
setting.

Relates #20895

artnowo/elasticsearch,mortonsykes/elasticsearch,sneivandt/elasticsearch,fernandozhu/elasticsearch,geidies/elasticsearch,vroyer/elasticassandra,vroyer/elassandra,strapdata/elassandra,robin13/elasticsearch,rajanm/elasticsearch,s1monw/elasticsearch,pozhidaevak/elasticsearch,bawse/elasticsearch,wangtuo/elasticsearch,coding0011/elasticsearch,IanvsPoplicola/elasticsearch,a2lin/elasticsearch,wuranbo/elasticsearch,rajanm/elasticsearch,Helen-Zhao/elasticsearch,masaruh/elasticsearch,henakamaMSFT/elasticsearch,brandonkearby/elasticsearch,gingerwizard/elasticsearch,maddin2016/elasticsearch,rlugojr/elasticsearch,qwerty4030/elasticsearch,sneivandt/elasticsearch,nazarewk/elasticsearch,glefloch/elasticsearch,GlenRSmith/elasticsearch,coding0011/elasticsearch,ZTE-PaaS/elasticsearch,JervyShi/elasticsearch,naveenhooda2000/elasticsearch,LeoYao/elasticsearch,mortonsykes/elasticsearch,jimczi/elasticsearch,s1monw/elasticsearch,i-am-Nathan/elasticsearch,nknize/elasticsearch,nezirus/elasticsearch,Stacey-Gammon/elasticsearch,liweinan0423/elasticsearch,gfyoung/elasticsearch,uschindler/elasticsearch,kalimatas/elasticsearch,pozhidaevak/elasticsearch,elasticdog/elasticsearch,mohit/elasticsearch,winstonewert/elasticsearch,JackyMai/elasticsearch,scottsom/elasticsearch,maddin2016/elasticsearch,wenpos/elasticsearch,geidies/elasticsearch,mikemccand/elasticsearch,obourgain/elasticsearch,spiegela/elasticsearch,artnowo/elasticsearch,naveenhooda2000/elasticsearch,mikemccand/elasticsearch,s1monw/elasticsearch,shreejay/elasticsearch,gmarz/elasticsearch,LewayneNaidoo/elasticsearch,LeoYao/elasticsearch,nazarewk/elasticsearch,scottsom/elasticsearch,fforbeck/elasticsearch,spiegela/elasticsearch,StefanGor/elasticsearch,winstonewert/elasticsearch,JackyMai/elasticsearch,markwalkom/elasticsearch,umeshdangat/elasticsearch,mikemccand/elasticsearch,fernandozhu/elasticsearch,gmarz/elasticsearch,LeoYao/elasticsearch,MisterAndersen/elasticsearch,JackyMai/elasticsearch,maddin2016/elasticsearch,scorpionvicky/elasticsearch,elasticdog/elasticsearch,lks21c/elasticsearch,shreejay/elasticsearch,vroyer/elassandra,Stacey-Gammon/elasticsearch,mikemccand/elasticsearch,mohit/elasticsearch,GlenRSmith/elasticsearch,JSCooke/elasticsearch,JSCooke/elasticsearch,fforbeck/elasticsearch,markwalkom/elasticsearch,gfyoung/elasticsearch,alexshadow007/elasticsearch,mortonsykes/elasticsearch,i-am-Nathan/elasticsearch,nknize/elasticsearch,rlugojr/elasticsearch,nilabhsagar/elasticsearch,nilabhsagar/elasticsearch,umeshdangat/elasticsearch,HonzaKral/elasticsearch,IanvsPoplicola/elasticsearch,mohit/elasticsearch,fforbeck/elasticsearch,brandonkearby/elasticsearch,JackyMai/elasticsearch,LeoYao/elasticsearch,StefanGor/elasticsearch,jimczi/elasticsearch,coding0011/elasticsearch,henakamaMSFT/elasticsearch,shreejay/elasticsearch,yanjunh/elasticsearch,LewayneNaidoo/elasticsearch,robin13/elasticsearch,rajanm/elasticsearch,spiegela/elasticsearch,winstonewert/elasticsearch,glefloch/elasticsearch,elasticdog/elasticsearch,gingerwizard/elasticsearch,naveenhooda2000/elasticsearch,LewayneNaidoo/elasticsearch,sneivandt/elasticsearch,s1monw/elasticsearch,JackyMai/elasticsearch,nazarewk/elasticsearch,robin13/elasticsearch,mohit/elasticsearch,nezirus/elasticsearch,IanvsPoplicola/elasticsearch,fernandozhu/elasticsearch,lks21c/elasticsearch,scorpionvicky/elasticsearch,i-am-Nathan/elasticsearch,jprante/elasticsearch,nazarewk/elasticsearch,masaruh/elasticsearch,StefanGor/elasticsearch,vroyer/elassandra,njlawton/elasticsearch,scorpionvicky/elasticsearch,sneivandt/elasticsearch,rlugojr/elasticsearch,nknize/elasticsearch,ZTE-PaaS/elasticsearch,MaineC/elasticsearch,mohit/elasticsearch,uschindler/elasticsearch,scorpionvicky/elasticsearch,jprante/elasticsearch,fred84/elasticsearch,pozhidaevak/elasticsearch,gfyoung/elasticsearch,geidies/elasticsearch,gingerwizard/elasticsearch,kalimatas/elasticsearch,mjason3/elasticsearch,nazarewk/elasticsearch,elasticdog/elasticsearch,ThiagoGarciaAlves/elasticsearch,umeshdangat/elasticsearch,kalimatas/elasticsearch,gmarz/elasticsearch,scottsom/elasticsearch,Stacey-Gammon/elasticsearch,wangtuo/elasticsearch,njlawton/elasticsearch,scottsom/elasticsearch,brandonkearby/elasticsearch,C-Bish/elasticsearch,artnowo/elasticsearch,yanjunh/elasticsearch,henakamaMSFT/elasticsearch,i-am-Nathan/elasticsearch,MaineC/elasticsearch,nilabhsagar/elasticsearch,lks21c/elasticsearch,gingerwizard/elasticsearch,rajanm/elasticsearch,bawse/elasticsearch,Stacey-Gammon/elasticsearch,LeoYao/elasticsearch,Shepard1212/elasticsearch,henakamaMSFT/elasticsearch,GlenRSmith/elasticsearch,ThiagoGarciaAlves/elasticsearch,nezirus/elasticsearch,naveenhooda2000/elasticsearch,obourgain/elasticsearch,alexshadow007/elasticsearch,elasticdog/elasticsearch,HonzaKral/elasticsearch,mjason3/elasticsearch,vroyer/elasticassandra,a2lin/elasticsearch,bawse/elasticsearch,lks21c/elasticsearch,scottsom/elasticsearch,alexshadow007/elasticsearch,geidies/elasticsearch,masaruh/elasticsearch,spiegela/elasticsearch,pozhidaevak/elasticsearch,uschindler/elasticsearch,jimczi/elasticsearch,C-Bish/elasticsearch,nezirus/elasticsearch,alexshadow007/elasticsearch,yanjunh/elasticsearch,LeoYao/elasticsearch,jprante/elasticsearch,rlugojr/elasticsearch,qwerty4030/elasticsearch,winstonewert/elasticsearch,fred84/elasticsearch,ThiagoGarciaAlves/elasticsearch,jprante/elasticsearch,mjason3/elasticsearch,glefloch/elasticsearch,liweinan0423/elasticsearch,Shepard1212/elasticsearch,C-Bish/elasticsearch,a2lin/elasticsearch,MisterAndersen/elasticsearch,kalimatas/elasticsearch,njlawton/elasticsearch,liweinan0423/elasticsearch,StefanGor/elasticsearch,yanjunh/elasticsearch,Helen-Zhao/elasticsearch,maddin2016/elasticsearch,gmarz/elasticsearch,jimczi/elasticsearch,a2lin/elasticsearch,artnowo/elasticsearch,umeshdangat/elasticsearch,strapdata/elassandra,Stacey-Gammon/elasticsearch,ZTE-PaaS/elasticsearch,JSCooke/elasticsearch,ThiagoGarciaAlves/elasticsearch,i-am-Nathan/elasticsearch,wangtuo/elasticsearch,coding0011/elasticsearch,wenpos/elasticsearch,gingerwizard/elasticsearch,markwalkom/elasticsearch,naveenhooda2000/elasticsearch,coding0011/elasticsearch,njlawton/elasticsearch,wuranbo/elasticsearch,strapdata/elassandra,ZTE-PaaS/elasticsearch,IanvsPoplicola/elasticsearch,fred84/elasticsearch,markwalkom/elasticsearch,liweinan0423/elasticsearch,geidies/elasticsearch,shreejay/elasticsearch,nilabhsagar/elasticsearch,LewayneNaidoo/elasticsearch,mortonsykes/elasticsearch,LeoYao/elasticsearch,fred84/elasticsearch,MisterAndersen/elasticsearch,s1monw/elasticsearch,C-Bish/elasticsearch,robin13/elasticsearch,njlawton/elasticsearch,henakamaMSFT/elasticsearch,wangtuo/elasticsearch,obourgain/elasticsearch,fernandozhu/elasticsearch,brandonkearby/elasticsearch,strapdata/elassandra,gmarz/elasticsearch,bawse/elasticsearch,JSCooke/elasticsearch,glefloch/elasticsearch,GlenRSmith/elasticsearch,uschindler/elasticsearch,qwerty4030/elasticsearch,wuranbo/elasticsearch,GlenRSmith/elasticsearch,StefanGor/elasticsearch,ZTE-PaaS/elasticsearch,MaineC/elasticsearch,strapdata/elassandra,lks21c/elasticsearch,MaineC/elasticsearch,masaruh/elasticsearch,rajanm/elasticsearch,geidies/elasticsearch,mortonsykes/elasticsearch,JervyShi/elasticsearch,scorpionvicky/elasticsearch,artnowo/elasticsearch,ThiagoGarciaAlves/elasticsearch,Helen-Zhao/elasticsearch,C-Bish/elasticsearch,qwerty4030/elasticsearch,wenpos/elasticsearch,mikemccand/elasticsearch,uschindler/elasticsearch,sneivandt/elasticsearch,jimczi/elasticsearch,brandonkearby/elasticsearch,gfyoung/elasticsearch,umeshdangat/elasticsearch,rajanm/elasticsearch,MaineC/elasticsearch,markwalkom/elasticsearch,IanvsPoplicola/elasticsearch,qwerty4030/elasticsearch,JervyShi/elasticsearch,Shepard1212/elasticsearch,wuranbo/elasticsearch,nezirus/elasticsearch,masaruh/elasticsearch,pozhidaevak/elasticsearch,alexshadow007/elasticsearch,wenpos/elasticsearch,gingerwizard/elasticsearch,rlugojr/elasticsearch,MisterAndersen/elasticsearch,markwalkom/elasticsearch,maddin2016/elasticsearch,HonzaKral/elasticsearch,gfyoung/elasticsearch,a2lin/elasticsearch,mjason3/elasticsearch,liweinan0423/elasticsearch,bawse/elasticsearch,Shepard1212/elasticsearch,MisterAndersen/elasticsearch,JervyShi/elasticsearch,gingerwizard/elasticsearch,kalimatas/elasticsearch,HonzaKral/elasticsearch,nknize/elasticsearch,jprante/elasticsearch,mjason3/elasticsearch,ThiagoGarciaAlves/elasticsearch,wuranbo/elasticsearch,robin13/elasticsearch,obourgain/elasticsearch,JervyShi/elasticsearch,JervyShi/elasticsearch,winstonewert/elasticsearch,Helen-Zhao/elasticsearch,spiegela/elasticsearch,fernandozhu/elasticsearch,obourgain/elasticsearch,wangtuo/elasticsearch,fred84/elasticsearch,nknize/elasticsearch,nilabhsagar/elasticsearch,JSCooke/elasticsearch,Shepard1212/elasticsearch,LewayneNaidoo/elasticsearch,wenpos/elasticsearch,shreejay/elasticsearch,yanjunh/elasticsearch,fforbeck/elasticsearch,Helen-Zhao/elasticsearch,vroyer/elasticassandra,fforbeck/elasticsearch,glefloch/elasticsearch