update documentation with release 2.3.1
update documentation with release 2.3.1

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