Add stale shard issue to Resiliency page
Add stale shard issue to Resiliency page

This commit adds a simple description of the stale shard issue to the
Resiliency page.

Relates #14671

jchampion/elasticsearch,shreejay/elasticsearch,myelin/elasticsearch,lks21c/elasticsearch,wuranbo/elasticsearch,wbowling/elasticsearch,jpountz/elasticsearch,scorpionvicky/elasticsearch,gingerwizard/elasticsearch,uschindler/elasticsearch,shreejay/elasticsearch,vroyer/elassandra,mikemccand/elasticsearch,wbowling/elasticsearch,maddin2016/elasticsearch,nazarewk/elasticsearch,yynil/elasticsearch,fernandozhu/elasticsearch,xuzha/elasticsearch,davidvgalbraith/elasticsearch,HonzaKral/elasticsearch,gmarz/elasticsearch,rmuir/elasticsearch,camilojd/elasticsearch,brandonkearby/elasticsearch,snikch/elasticsearch,mmaracic/elasticsearch,trangvh/elasticsearch,dongjoon-hyun/elasticsearch,jimczi/elasticsearch,gfyoung/elasticsearch,fred84/elasticsearch,gingerwizard/elasticsearch,naveenhooda2000/elasticsearch,fforbeck/elasticsearch,rajanm/elasticsearch,ThiagoGarciaAlves/elasticsearch,strapdata/elassandra5-rc,nazarewk/elasticsearch,yynil/elasticsearch,fforbeck/elasticsearch,clintongormley/elasticsearch,njlawton/elasticsearch,dpursehouse/elasticsearch,LewayneNaidoo/elasticsearch,ThiagoGarciaAlves/elasticsearch,shreejay/elasticsearch,obourgain/elasticsearch,camilojd/elasticsearch,JervyShi/elasticsearch,mapr/elasticsearch,nezirus/elasticsearch,scottsom/elasticsearch,snikch/elasticsearch,rhoml/elasticsearch,spiegela/elasticsearch,njlawton/elasticsearch,MisterAndersen/elasticsearch,JackyMai/elasticsearch,markwalkom/elasticsearch,ricardocerq/elasticsearch,davidvgalbraith/elasticsearch,mapr/elasticsearch,rajanm/elasticsearch,snikch/elasticsearch,dpursehouse/elasticsearch,jprante/elasticsearch,elasticdog/elasticsearch,PhaedrusTheGreek/elasticsearch,masaruh/elasticsearch,ESamir/elasticsearch,fforbeck/elasticsearch,gmarz/elasticsearch,andrejserafim/elasticsearch,scottsom/elasticsearch,wbowling/elasticsearch,liweinan0423/elasticsearch,GlenRSmith/elasticsearch,jprante/elasticsearch,ESamir/elasticsearch,jchampion/elasticsearch,alexshadow007/elasticsearch,gingerwizard/elasticsearch,xuzha/elasticsearch,qwerty4030/elasticsearch,MisterAndersen/elasticsearch,MaineC/elasticsearch,rmuir/elasticsearch,nilabhsagar/elasticsearch,JervyShi/elasticsearch,henakamaMSFT/elasticsearch,wuranbo/elasticsearch,shreejay/elasticsearch,scorpionvicky/elasticsearch,vroyer/elasticassandra,pozhidaevak/elasticsearch,wenpos/elasticsearch,glefloch/elasticsearch,gfyoung/elasticsearch,glefloch/elasticsearch,s1monw/elasticsearch,mjason3/elasticsearch,avikurapati/elasticsearch,rlugojr/elasticsearch,polyfractal/elasticsearch,i-am-Nathan/elasticsearch,PhaedrusTheGreek/elasticsearch,ESamir/elasticsearch,vroyer/elassandra,henakamaMSFT/elasticsearch,awislowski/elasticsearch,avikurapati/elasticsearch,tebriel/elasticsearch,fred84/elasticsearch,LeoYao/elasticsearch,tebriel/elasticsearch,jbertouch/elasticsearch,i-am-Nathan/elasticsearch,ivansun1010/elasticsearch,HonzaKral/elasticsearch,markharwood/elasticsearch,kalimatas/elasticsearch,MaineC/elasticsearch,AndreKR/elasticsearch,zkidkid/elasticsearch,ESamir/elasticsearch,wbowling/elasticsearch,JSCooke/elasticsearch,girirajsharma/elasticsearch,xuzha/elasticsearch,wenpos/elasticsearch,gmarz/elasticsearch,gfyoung/elasticsearch,s1monw/elasticsearch,jchampion/elasticsearch,jbertouch/elasticsearch,sreeramjayan/elasticsearch,nomoa/elasticsearch,spiegela/elasticsearch,JSCooke/elasticsearch,a2lin/elasticsearch,GlenRSmith/elasticsearch,F0lha/elasticsearch,jbertouch/elasticsearch,diendt/elasticsearch,yanjunh/elasticsearch,AndreKR/elasticsearch,spiegela/elasticsearch,ZTE-PaaS/elasticsearch,LewayneNaidoo/elasticsearch,Shepard1212/elasticsearch,shreejay/elasticsearch,martinstuga/elasticsearch,Stacey-Gammon/elasticsearch,dpursehouse/elasticsearch,nezirus/elasticsearch,robin13/elasticsearch,nezirus/elasticsearch,wangtuo/elasticsearch,vroyer/elassandra,a2lin/elasticsearch,episerver/elasticsearch,mapr/elasticsearch,davidvgalbraith/elasticsearch,ThiagoGarciaAlves/elasticsearch,LewayneNaidoo/elasticsearch,yanjunh/elasticsearch,bawse/elasticsearch,strapdata/elassandra5-rc,maddin2016/elasticsearch,martinstuga/elasticsearch,nezirus/elasticsearch,obourgain/elasticsearch,dongjoon-hyun/elasticsearch,i-am-Nathan/elasticsearch,MisterAndersen/elasticsearch,jimczi/elasticsearch,JervyShi/elasticsearch,geidies/elasticsearch,polyfractal/elasticsearch,awislowski/elasticsearch,spiegela/elasticsearch,maddin2016/elasticsearch,mohit/elasticsearch,dongjoon-hyun/elasticsearch,F0lha/elasticsearch,uschindler/elasticsearch,lks21c/elasticsearch,ivansun1010/elasticsearch,naveenhooda2000/elasticsearch,markharwood/elasticsearch,StefanGor/elasticsearch,jprante/elasticsearch,JervyShi/elasticsearch,geidies/elasticsearch,liweinan0423/elasticsearch,ThiagoGarciaAlves/elasticsearch,mmaracic/elasticsearch,avikurapati/elasticsearch,brandonkearby/elasticsearch,wbowling/elasticsearch,dpursehouse/elasticsearch,jbertouch/elasticsearch,gmarz/elasticsearch,lks21c/elasticsearch,markharwood/elasticsearch,fred84/elasticsearch,PhaedrusTheGreek/elasticsearch,episerver/elasticsearch,F0lha/elasticsearch,andrejserafim/elasticsearch,jprante/elasticsearch,polyfractal/elasticsearch,gingerwizard/elasticsearch,MisterAndersen/elasticsearch,gfyoung/elasticsearch,brandonkearby/elasticsearch,jpountz/elasticsearch,mohit/elasticsearch,HonzaKral/elasticsearch,liweinan0423/elasticsearch,vroyer/elasticassandra,IanvsPoplicola/elasticsearch,markwalkom/elasticsearch,IanvsPoplicola/elasticsearch,liweinan0423/elasticsearch,PhaedrusTheGreek/elasticsearch,mjason3/elasticsearch,wenpos/elasticsearch,sreeramjayan/elasticsearch,mapr/elasticsearch,JervyShi/elasticsearch,C-Bish/elasticsearch,cwurm/elasticsearch,F0lha/elasticsearch,episerver/elasticsearch,LeoYao/elasticsearch,ESamir/elasticsearch,snikch/elasticsearch,AndreKR/elasticsearch,henakamaMSFT/elasticsearch,cwurm/elasticsearch,wuranbo/elasticsearch,Helen-Zhao/elasticsearch,StefanGor/elasticsearch,PhaedrusTheGreek/elasticsearch,Shepard1212/elasticsearch,F0lha/elasticsearch,diendt/elasticsearch,mikemccand/elasticsearch,rajanm/elasticsearch,njlawton/elasticsearch,tebriel/elasticsearch,mjason3/elasticsearch,a2lin/elasticsearch,gmarz/elasticsearch,coding0011/elasticsearch,diendt/elasticsearch,markwalkom/elasticsearch,alexshadow007/elasticsearch,Stacey-Gammon/elasticsearch,girirajsharma/elasticsearch,jchampion/elasticsearch,JSCooke/elasticsearch,ricardocerq/elasticsearch,kalimatas/elasticsearch,nilabhsagar/elasticsearch,coding0011/elasticsearch,artnowo/elasticsearch,qwerty4030/elasticsearch,trangvh/elasticsearch,gingerwizard/elasticsearch,obourgain/elasticsearch,JervyShi/elasticsearch,yynil/elasticsearch,MaineC/elasticsearch,HonzaKral/elasticsearch,henakamaMSFT/elasticsearch,rhoml/elasticsearch,uschindler/elasticsearch,StefanGor/elasticsearch,strapdata/elassandra5-rc,jbertouch/elasticsearch,wuranbo/elasticsearch,umeshdangat/elasticsearch,awislowski/elasticsearch,bawse/elasticsearch,trangvh/elasticsearch,geidies/elasticsearch,uschindler/elasticsearch,andrejserafim/elasticsearch,lks21c/elasticsearch,jpountz/elasticsearch,kaneshin/elasticsearch,yynil/elasticsearch,wuranbo/elasticsearch,nomoa/elasticsearch,ThiagoGarciaAlves/elasticsearch,bawse/elasticsearch,a2lin/elasticsearch,MisterAndersen/elasticsearch,awislowski/elasticsearch,camilojd/elasticsearch,yanjunh/elasticsearch,nknize/elasticsearch,sneivandt/elasticsearch,nknize/elasticsearch,LeoYao/elasticsearch,wangtuo/elasticsearch,rlugojr/elasticsearch,kaneshin/elasticsearch,jbertouch/elasticsearch,a2lin/elasticsearch,umeshdangat/elasticsearch,camilojd/elasticsearch,clintongormley/elasticsearch,kaneshin/elasticsearch,artnowo/elasticsearch,palecur/elasticsearch,avikurapati/elasticsearch,mohit/elasticsearch,mjason3/elasticsearch,s1monw/elasticsearch,ivansun1010/elasticsearch,myelin/elasticsearch,IanvsPoplicola/elasticsearch,geidies/elasticsearch,scottsom/elasticsearch,Stacey-Gammon/elasticsearch,sneivandt/elasticsearch,bawse/elasticsearch,JackyMai/elasticsearch,scorpionvicky/elasticsearch,mmaracic/elasticsearch,martinstuga/elasticsearch,sreeramjayan/elasticsearch,strapdata/elassandra5-rc,xuzha/elasticsearch,snikch/elasticsearch,palecur/elasticsearch,maddin2016/elasticsearch,myelin/elasticsearch,rlugojr/elasticsearch,rajanm/elasticsearch,wangtuo/elasticsearch,glefloch/elasticsearch,sreeramjayan/elasticsearch,diendt/elasticsearch,dongjoon-hyun/elasticsearch,mikemccand/elasticsearch,masaruh/elasticsearch,rlugojr/elasticsearch,diendt/elasticsearch,markharwood/elasticsearch,MaineC/elasticsearch,scorpionvicky/elasticsearch,clintongormley/elasticsearch,njlawton/elasticsearch,ricardocerq/elasticsearch,geidies/elasticsearch,masaruh/elasticsearch,pozhidaevak/elasticsearch,nomoa/elasticsearch,C-Bish/elasticsearch,wbowling/elasticsearch,C-Bish/elasticsearch,umeshdangat/elasticsearch,wenpos/elasticsearch,dpursehouse/elasticsearch,JSCooke/elasticsearch,ivansun1010/elasticsearch,rmuir/elasticsearch,JackyMai/elasticsearch,rlugojr/elasticsearch,ivansun1010/elasticsearch,ESamir/elasticsearch,fforbeck/elasticsearch,fernandozhu/elasticsearch,strapdata/elassandra,obourgain/elasticsearch,mmaracic/elasticsearch,nknize/elasticsearch,Shepard1212/elasticsearch,i-am-Nathan/elasticsearch,rajanm/elasticsearch,markharwood/elasticsearch,masaruh/elasticsearch,kaneshin/elasticsearch,LewayneNaidoo/elasticsearch,fernandozhu/elasticsearch,dongjoon-hyun/elasticsearch,mortonsykes/elasticsearch,camilojd/elasticsearch,clintongormley/elasticsearch,robin13/elasticsearch,palecur/elasticsearch,mohit/elasticsearch,martinstuga/elasticsearch,mohit/elasticsearch,pozhidaevak/elasticsearch,fforbeck/elasticsearch,henakamaMSFT/elasticsearch,mmaracic/elasticsearch,cwurm/elasticsearch,pozhidaevak/elasticsearch,Stacey-Gammon/elasticsearch,mortonsykes/elasticsearch,StefanGor/elasticsearch,cwurm/elasticsearch,jimczi/elasticsearch,geidies/elasticsearch,lks21c/elasticsearch,clintongormley/elasticsearch,wbowling/elasticsearch,girirajsharma/elasticsearch,girirajsharma/elasticsearch,MaineC/elasticsearch,obourgain/elasticsearch,strapdata/elassandra,snikch/elasticsearch,markwalkom/elasticsearch,mapr/elasticsearch,markharwood/elasticsearch,coding0011/elasticsearch,jprante/elasticsearch,LewayneNaidoo/elasticsearch,C-Bish/elasticsearch,andrejserafim/elasticsearch,polyfractal/elasticsearch,elasticdog/elasticsearch,mikemccand/elasticsearch,elasticdog/elasticsearch,markwalkom/elasticsearch,ricardocerq/elasticsearch,GlenRSmith/elasticsearch,naveenhooda2000/elasticsearch,zkidkid/elasticsearch,IanvsPoplicola/elasticsearch,gingerwizard/elasticsearch,fred84/elasticsearch,mjason3/elasticsearch,sreeramjayan/elasticsearch,Helen-Zhao/elasticsearch,robin13/elasticsearch,pozhidaevak/elasticsearch,scottsom/elasticsearch,C-Bish/elasticsearch,sneivandt/elasticsearch,AndreKR/elasticsearch,strapdata/elassandra,martinstuga/elasticsearch,winstonewert/elasticsearch,ZTE-PaaS/elasticsearch,mortonsykes/elasticsearch,diendt/elasticsearch,F0lha/elasticsearch,robin13/elasticsearch,davidvgalbraith/elasticsearch,trangvh/elasticsearch,spiegela/elasticsearch,scorpionvicky/elasticsearch,rmuir/elasticsearch,LeoYao/elasticsearch,mmaracic/elasticsearch,fernandozhu/elasticsearch,girirajsharma/elasticsearch,xuzha/elasticsearch,ZTE-PaaS/elasticsearch,palecur/elasticsearch,Shepard1212/elasticsearch,elasticdog/elasticsearch,jpountz/elasticsearch,vroyer/elasticassandra,LeoYao/elasticsearch,jchampion/elasticsearch,qwerty4030/elasticsearch,jpountz/elasticsearch,njlawton/elasticsearch,strapdata/elassandra,i-am-Nathan/elasticsearch,rhoml/elasticsearch,rhoml/elasticsearch,jpountz/elasticsearch,nazarewk/elasticsearch,myelin/elasticsearch,polyfractal/elasticsearch,zkidkid/elasticsearch,davidvgalbraith/elasticsearch,JackyMai/elasticsearch,tebriel/elasticsearch,kaneshin/elasticsearch,andrejserafim/elasticsearch,polyfractal/elasticsearch,nknize/elasticsearch,yanjunh/elasticsearch,coding0011/elasticsearch,JackyMai/elasticsearch,qwerty4030/elasticsearch,artnowo/elasticsearch,fred84/elasticsearch,Helen-Zhao/elasticsearch,masaruh/elasticsearch,PhaedrusTheGreek/elasticsearch,kalimatas/elasticsearch,avikurapati/elasticsearch,rmuir/elasticsearch,glefloch/elasticsearch,martinstuga/elasticsearch,LeoYao/elasticsearch,artnowo/elasticsearch,Stacey-Gammon/elasticsearch,wenpos/elasticsearch,IanvsPoplicola/elasticsearch,nomoa/elasticsearch,umeshdangat/elasticsearch,jchampion/elasticsearch,liweinan0423/elasticsearch,rmuir/elasticsearch,mikemccand/elasticsearch,robin13/elasticsearch,nomoa/elasticsearch,artnowo/elasticsearch,nazarewk/elasticsearch,trangvh/elasticsearch,elasticdog/elasticsearch,maddin2016/elasticsearch,camilojd/elasticsearch,clintongormley/elasticsearch,naveenhooda2000/elasticsearch,ZTE-PaaS/elasticsearch,sreeramjayan/elasticsearch,Helen-Zhao/elasticsearch,nilabhsagar/elasticsearch,awislowski/elasticsearch,nilabhsagar/elasticsearch,zkidkid/elasticsearch,brandonkearby/elasticsearch,uschindler/elasticsearch,jimczi/elasticsearch,StefanGor/elasticsearch,JSCooke/elasticsearch,sneivandt/elasticsearch,ricardocerq/elasticsearch,bawse/elasticsearch,kalimatas/elasticsearch,nknize/elasticsearch,gingerwizard/elasticsearch,s1monw/elasticsearch,winstonewert/elasticsearch,qwerty4030/elasticsearch,rajanm/elasticsearch,sneivandt/elasticsearch,rhoml/elasticsearch,cwurm/elasticsearch,ZTE-PaaS/elasticsearch,nezirus/elasticsearch,zkidkid/elasticsearch,davidvgalbraith/elasticsearch,tebriel/elasticsearch,GlenRSmith/elasticsearch,rhoml/elasticsearch,nilabhsagar/elasticsearch,PhaedrusTheGreek/elasticsearch,yynil/elasticsearch,winstonewert/elasticsearch,s1monw/elasticsearch,glefloch/elasticsearch,wangtuo/elasticsearch,xuzha/elasticsearch,yynil/elasticsearch,Helen-Zhao/elasticsearch,myelin/elasticsearch,jimczi/elasticsearch,tebriel/elasticsearch,Shepard1212/elasticsearch,alexshadow007/elasticsearch,naveenhooda2000/elasticsearch,strapdata/elassandra,andrejserafim/elasticsearch,girirajsharma/elasticsearch,mortonsykes/elasticsearch,ivansun1010/elasticsearch,nazarewk/elasticsearch,coding0011/elasticsearch,wangtuo/elasticsearch,yanjunh/elasticsearch,ThiagoGarciaAlves/elasticsearch,umeshdangat/elasticsearch,kaneshin/elasticsearch,alexshadow007/elasticsearch,AndreKR/elasticsearch,mapr/elasticsearch,episerver/elasticsearch,winstonewert/elasticsearch,mortonsykes/elasticsearch,brandonkearby/elasticsearch,alexshadow007/elasticsearch,gfyoung/elasticsearch,episerver/elasticsearch,winstonewert/elasticsearch,markwalkom/elasticsearch,palecur/elasticsearch,fernandozhu/elasticsearch,kalimatas/elasticsearch,AndreKR/elasticsearch,strapdata/elassandra5-rc,GlenRSmith/elasticsearch,scottsom/elasticsearch,LeoYao/elasticsearch