Remove extra mostly duplicate readme file
Remove extra mostly duplicate readme file

It looks like the readme was duplicated when plugins were merged back
into the repo. We removed all these extra files from the plugins, this
removes the remaining duplicate from core.

closes #18597

geidies/elasticsearch,vroyer/elasticassandra,fernandozhu/elasticsearch,mortonsykes/elasticsearch,geidies/elasticsearch,s1monw/elasticsearch,Shepard1212/elasticsearch,bawse/elasticsearch,strapdata/elassandra,JervyShi/elasticsearch,i-am-Nathan/elasticsearch,cwurm/elasticsearch,lks21c/elasticsearch,yanjunh/elasticsearch,artnowo/elasticsearch,strapdata/elassandra5-rc,nknize/elasticsearch,maddin2016/elasticsearch,mortonsykes/elasticsearch,IanvsPoplicola/elasticsearch,IanvsPoplicola/elasticsearch,jimczi/elasticsearch,MisterAndersen/elasticsearch,rajanm/elasticsearch,zkidkid/elasticsearch,uschindler/elasticsearch,jprante/elasticsearch,JackyMai/elasticsearch,mjason3/elasticsearch,rlugojr/elasticsearch,cwurm/elasticsearch,girirajsharma/elasticsearch,alexshadow007/elasticsearch,gfyoung/elasticsearch,girirajsharma/elasticsearch,coding0011/elasticsearch,robin13/elasticsearch,C-Bish/elasticsearch,qwerty4030/elasticsearch,dongjoon-hyun/elasticsearch,sneivandt/elasticsearch,GlenRSmith/elasticsearch,masaruh/elasticsearch,trangvh/elasticsearch,yanjunh/elasticsearch,avikurapati/elasticsearch,naveenhooda2000/elasticsearch,njlawton/elasticsearch,trangvh/elasticsearch,pozhidaevak/elasticsearch,lks21c/elasticsearch,glefloch/elasticsearch,rajanm/elasticsearch,uschindler/elasticsearch,a2lin/elasticsearch,fernandozhu/elasticsearch,GlenRSmith/elasticsearch,zkidkid/elasticsearch,dpursehouse/elasticsearch,shreejay/elasticsearch,wangtuo/elasticsearch,gfyoung/elasticsearch,henakamaMSFT/elasticsearch,MisterAndersen/elasticsearch,gmarz/elasticsearch,Helen-Zhao/elasticsearch,LewayneNaidoo/elasticsearch,wangtuo/elasticsearch,glefloch/elasticsearch,nezirus/elasticsearch,maddin2016/elasticsearch,StefanGor/elasticsearch,ThiagoGarciaAlves/elasticsearch,avikurapati/elasticsearch,mikemccand/elasticsearch,zkidkid/elasticsearch,fred84/elasticsearch,nazarewk/elasticsearch,mikemccand/elasticsearch,henakamaMSFT/elasticsearch,pozhidaevak/elasticsearch,coding0011/elasticsearch,fred84/elasticsearch,spiegela/elasticsearch,scorpionvicky/elasticsearch,mohit/elasticsearch,rajanm/elasticsearch,nknize/elasticsearch,StefanGor/elasticsearch,gmarz/elasticsearch,markwalkom/elasticsearch,C-Bish/elasticsearch,nezirus/elasticsearch,robin13/elasticsearch,scottsom/elasticsearch,brandonkearby/elasticsearch,jprante/elasticsearch,ZTE-PaaS/elasticsearch,nknize/elasticsearch,s1monw/elasticsearch,obourgain/elasticsearch,vroyer/elasticassandra,MisterAndersen/elasticsearch,naveenhooda2000/elasticsearch,scottsom/elasticsearch,trangvh/elasticsearch,dongjoon-hyun/elasticsearch,rlugojr/elasticsearch,a2lin/elasticsearch,geidies/elasticsearch,HonzaKral/elasticsearch,s1monw/elasticsearch,fforbeck/elasticsearch,masaruh/elasticsearch,alexshadow007/elasticsearch,umeshdangat/elasticsearch,artnowo/elasticsearch,rlugojr/elasticsearch,nknize/elasticsearch,elasticdog/elasticsearch,scorpionvicky/elasticsearch,Helen-Zhao/elasticsearch,LewayneNaidoo/elasticsearch,sneivandt/elasticsearch,avikurapati/elasticsearch,pozhidaevak/elasticsearch,camilojd/elasticsearch,brandonkearby/elasticsearch,JackyMai/elasticsearch,geidies/elasticsearch,vroyer/elassandra,JackyMai/elasticsearch,strapdata/elassandra5-rc,LeoYao/elasticsearch,HonzaKral/elasticsearch,Helen-Zhao/elasticsearch,maddin2016/elasticsearch,strapdata/elassandra5-rc,artnowo/elasticsearch,brandonkearby/elasticsearch,Stacey-Gammon/elasticsearch,qwerty4030/elasticsearch,njlawton/elasticsearch,JSCooke/elasticsearch,wenpos/elasticsearch,uschindler/elasticsearch,strapdata/elassandra,JervyShi/elasticsearch,gmarz/elasticsearch,njlawton/elasticsearch,mjason3/elasticsearch,njlawton/elasticsearch,umeshdangat/elasticsearch,naveenhooda2000/elasticsearch,LewayneNaidoo/elasticsearch,winstonewert/elasticsearch,ricardocerq/elasticsearch,JervyShi/elasticsearch,wangtuo/elasticsearch,markwalkom/elasticsearch,a2lin/elasticsearch,scottsom/elasticsearch,glefloch/elasticsearch,gingerwizard/elasticsearch,Helen-Zhao/elasticsearch,JackyMai/elasticsearch,mortonsykes/elasticsearch,nezirus/elasticsearch,ricardocerq/elasticsearch,awislowski/elasticsearch,dpursehouse/elasticsearch,spiegela/elasticsearch,strapdata/elassandra5-rc,yanjunh/elasticsearch,avikurapati/elasticsearch,LeoYao/elasticsearch,scottsom/elasticsearch,gfyoung/elasticsearch,yanjunh/elasticsearch,StefanGor/elasticsearch,palecur/elasticsearch,C-Bish/elasticsearch,liweinan0423/elasticsearch,dongjoon-hyun/elasticsearch,njlawton/elasticsearch,Stacey-Gammon/elasticsearch,elasticdog/elasticsearch,shreejay/elasticsearch,gingerwizard/elasticsearch,camilojd/elasticsearch,mohit/elasticsearch,gingerwizard/elasticsearch,elasticdog/elasticsearch,bawse/elasticsearch,Helen-Zhao/elasticsearch,ThiagoGarciaAlves/elasticsearch,dongjoon-hyun/elasticsearch,JSCooke/elasticsearch,jprante/elasticsearch,palecur/elasticsearch,cwurm/elasticsearch,bawse/elasticsearch,elasticdog/elasticsearch,coding0011/elasticsearch,gmarz/elasticsearch,MaineC/elasticsearch,pozhidaevak/elasticsearch,JSCooke/elasticsearch,gingerwizard/elasticsearch,mjason3/elasticsearch,alexshadow007/elasticsearch,mortonsykes/elasticsearch,cwurm/elasticsearch,geidies/elasticsearch,shreejay/elasticsearch,henakamaMSFT/elasticsearch,girirajsharma/elasticsearch,nilabhsagar/elasticsearch,fred84/elasticsearch,C-Bish/elasticsearch,IanvsPoplicola/elasticsearch,jprante/elasticsearch,MaineC/elasticsearch,spiegela/elasticsearch,winstonewert/elasticsearch,fernandozhu/elasticsearch,Stacey-Gammon/elasticsearch,girirajsharma/elasticsearch,GlenRSmith/elasticsearch,liweinan0423/elasticsearch,nknize/elasticsearch,fred84/elasticsearch,Shepard1212/elasticsearch,mohit/elasticsearch,robin13/elasticsearch,liweinan0423/elasticsearch,LeoYao/elasticsearch,wuranbo/elasticsearch,ZTE-PaaS/elasticsearch,nilabhsagar/elasticsearch,s1monw/elasticsearch,gfyoung/elasticsearch,geidies/elasticsearch,bawse/elasticsearch,StefanGor/elasticsearch,rajanm/elasticsearch,scorpionvicky/elasticsearch,jimczi/elasticsearch,uschindler/elasticsearch,masaruh/elasticsearch,girirajsharma/elasticsearch,qwerty4030/elasticsearch,lks21c/elasticsearch,dpursehouse/elasticsearch,girirajsharma/elasticsearch,camilojd/elasticsearch,ThiagoGarciaAlves/elasticsearch,liweinan0423/elasticsearch,mohit/elasticsearch,nazarewk/elasticsearch,Stacey-Gammon/elasticsearch,mikemccand/elasticsearch,sreeramjayan/elasticsearch,sreeramjayan/elasticsearch,kalimatas/elasticsearch,winstonewert/elasticsearch,obourgain/elasticsearch,vroyer/elasticassandra,dpursehouse/elasticsearch,umeshdangat/elasticsearch,ThiagoGarciaAlves/elasticsearch,JervyShi/elasticsearch,ricardocerq/elasticsearch,LewayneNaidoo/elasticsearch,palecur/elasticsearch,glefloch/elasticsearch,dpursehouse/elasticsearch,Shepard1212/elasticsearch,LewayneNaidoo/elasticsearch,wuranbo/elasticsearch,fred84/elasticsearch,MaineC/elasticsearch,JSCooke/elasticsearch,sneivandt/elasticsearch,spiegela/elasticsearch,ZTE-PaaS/elasticsearch,LeoYao/elasticsearch,awislowski/elasticsearch,fforbeck/elasticsearch,avikurapati/elasticsearch,jimczi/elasticsearch,i-am-Nathan/elasticsearch,shreejay/elasticsearch,Shepard1212/elasticsearch,naveenhooda2000/elasticsearch,alexshadow007/elasticsearch,maddin2016/elasticsearch,obourgain/elasticsearch,trangvh/elasticsearch,winstonewert/elasticsearch,markwalkom/elasticsearch,henakamaMSFT/elasticsearch,fernandozhu/elasticsearch,zkidkid/elasticsearch,winstonewert/elasticsearch,sreeramjayan/elasticsearch,wuranbo/elasticsearch,fforbeck/elasticsearch,naveenhooda2000/elasticsearch,umeshdangat/elasticsearch,LeoYao/elasticsearch,dongjoon-hyun/elasticsearch,kalimatas/elasticsearch,maddin2016/elasticsearch,nazarewk/elasticsearch,qwerty4030/elasticsearch,trangvh/elasticsearch,MaineC/elasticsearch,LeoYao/elasticsearch,LeoYao/elasticsearch,gingerwizard/elasticsearch,MisterAndersen/elasticsearch,jprante/elasticsearch,mjason3/elasticsearch,mikemccand/elasticsearch,jimczi/elasticsearch,IanvsPoplicola/elasticsearch,rlugojr/elasticsearch,sreeramjayan/elasticsearch,nilabhsagar/elasticsearch,masaruh/elasticsearch,jimczi/elasticsearch,zkidkid/elasticsearch,MisterAndersen/elasticsearch,gfyoung/elasticsearch,nazarewk/elasticsearch,nilabhsagar/elasticsearch,GlenRSmith/elasticsearch,nezirus/elasticsearch,wenpos/elasticsearch,JervyShi/elasticsearch,C-Bish/elasticsearch,spiegela/elasticsearch,yanjunh/elasticsearch,umeshdangat/elasticsearch,markwalkom/elasticsearch,palecur/elasticsearch,uschindler/elasticsearch,rlugojr/elasticsearch,rajanm/elasticsearch,camilojd/elasticsearch,vroyer/elassandra,ZTE-PaaS/elasticsearch,bawse/elasticsearch,wuranbo/elasticsearch,strapdata/elassandra5-rc,strapdata/elassandra,a2lin/elasticsearch,i-am-Nathan/elasticsearch,ricardocerq/elasticsearch,fernandozhu/elasticsearch,alexshadow007/elasticsearch,brandonkearby/elasticsearch,brandonkearby/elasticsearch,gingerwizard/elasticsearch,liweinan0423/elasticsearch,nazarewk/elasticsearch,cwurm/elasticsearch,wenpos/elasticsearch,JSCooke/elasticsearch,glefloch/elasticsearch,i-am-Nathan/elasticsearch,markwalkom/elasticsearch,vroyer/elassandra,nilabhsagar/elasticsearch,StefanGor/elasticsearch,coding0011/elasticsearch,mikemccand/elasticsearch,coding0011/elasticsearch,HonzaKral/elasticsearch,robin13/elasticsearch,sneivandt/elasticsearch,HonzaKral/elasticsearch,masaruh/elasticsearch,artnowo/elasticsearch,GlenRSmith/elasticsearch,wenpos/elasticsearch,obourgain/elasticsearch,camilojd/elasticsearch,mortonsykes/elasticsearch,sreeramjayan/elasticsearch,awislowski/elasticsearch,artnowo/elasticsearch,robin13/elasticsearch,lks21c/elasticsearch,shreejay/elasticsearch,ThiagoGarciaAlves/elasticsearch,s1monw/elasticsearch,i-am-Nathan/elasticsearch,gmarz/elasticsearch,gingerwizard/elasticsearch,pozhidaevak/elasticsearch,rajanm/elasticsearch,palecur/elasticsearch,wenpos/elasticsearch,scottsom/elasticsearch,sreeramjayan/elasticsearch,Shepard1212/elasticsearch,MaineC/elasticsearch,kalimatas/elasticsearch,camilojd/elasticsearch,strapdata/elassandra,Stacey-Gammon/elasticsearch,mohit/elasticsearch,markwalkom/elasticsearch,a2lin/elasticsearch,henakamaMSFT/elasticsearch,fforbeck/elasticsearch,kalimatas/elasticsearch,wangtuo/elasticsearch,ricardocerq/elasticsearch,JackyMai/elasticsearch,fforbeck/elasticsearch,qwerty4030/elasticsearch,JervyShi/elasticsearch,elasticdog/elasticsearch,ThiagoGarciaAlves/elasticsearch,nezirus/elasticsearch,awislowski/elasticsearch,kalimatas/elasticsearch,wangtuo/elasticsearch,scorpionvicky/elasticsearch,obourgain/elasticsearch,lks21c/elasticsearch,awislowski/elasticsearch,sneivandt/elasticsearch,mjason3/elasticsearch,ZTE-PaaS/elasticsearch,strapdata/elassandra,IanvsPoplicola/elasticsearch,scorpionvicky/elasticsearch,wuranbo/elasticsearch