Update ingest-node.asciidoc
Update ingest-node.asciidoc

Documented `separator` in the `split processor

Closes https://github.com/elastic/elasticsearch/issues/17831
awislowski/elasticsearch,sreeramjayan/elasticsearch,mikemccand/elasticsearch,yanjunh/elasticsearch,wenpos/elasticsearch,JervyShi/elasticsearch,fred84/elasticsearch,gingerwizard/elasticsearch,strapdata/elassandra,nazarewk/elasticsearch,Helen-Zhao/elasticsearch,uschindler/elasticsearch,LeoYao/elasticsearch,i-am-Nathan/elasticsearch,ricardocerq/elasticsearch,nilabhsagar/elasticsearch,alexshadow007/elasticsearch,scorpionvicky/elasticsearch,rlugojr/elasticsearch,obourgain/elasticsearch,vroyer/elassandra,gingerwizard/elasticsearch,LeoYao/elasticsearch,nazarewk/elasticsearch,scottsom/elasticsearch,alexshadow007/elasticsearch,vroyer/elasticassandra,IanvsPoplicola/elasticsearch,njlawton/elasticsearch,camilojd/elasticsearch,lks21c/elasticsearch,Stacey-Gammon/elasticsearch,ThiagoGarciaAlves/elasticsearch,strapdata/elassandra5-rc,cwurm/elasticsearch,coding0011/elasticsearch,fred84/elasticsearch,gmarz/elasticsearch,awislowski/elasticsearch,nilabhsagar/elasticsearch,spiegela/elasticsearch,mortonsykes/elasticsearch,spiegela/elasticsearch,GlenRSmith/elasticsearch,C-Bish/elasticsearch,mohit/elasticsearch,maddin2016/elasticsearch,qwerty4030/elasticsearch,rajanm/elasticsearch,jimczi/elasticsearch,palecur/elasticsearch,mjason3/elasticsearch,nknize/elasticsearch,jimczi/elasticsearch,JackyMai/elasticsearch,mortonsykes/elasticsearch,GlenRSmith/elasticsearch,mortonsykes/elasticsearch,LeoYao/elasticsearch,obourgain/elasticsearch,awislowski/elasticsearch,trangvh/elasticsearch,sneivandt/elasticsearch,avikurapati/elasticsearch,jprante/elasticsearch,yanjunh/elasticsearch,sreeramjayan/elasticsearch,camilojd/elasticsearch,s1monw/elasticsearch,markwalkom/elasticsearch,StefanGor/elasticsearch,scorpionvicky/elasticsearch,scottsom/elasticsearch,gingerwizard/elasticsearch,MaineC/elasticsearch,nilabhsagar/elasticsearch,girirajsharma/elasticsearch,C-Bish/elasticsearch,shreejay/elasticsearch,JackyMai/elasticsearch,alexshadow007/elasticsearch,rajanm/elasticsearch,wuranbo/elasticsearch,Helen-Zhao/elasticsearch,s1monw/elasticsearch,gfyoung/elasticsearch,LeoYao/elasticsearch,myelin/elasticsearch,winstonewert/elasticsearch,brandonkearby/elasticsearch,awislowski/elasticsearch,LewayneNaidoo/elasticsearch,Shepard1212/elasticsearch,liweinan0423/elasticsearch,IanvsPoplicola/elasticsearch,LewayneNaidoo/elasticsearch,uschindler/elasticsearch,camilojd/elasticsearch,mikemccand/elasticsearch,gingerwizard/elasticsearch,MaineC/elasticsearch,GlenRSmith/elasticsearch,ricardocerq/elasticsearch,nknize/elasticsearch,wenpos/elasticsearch,naveenhooda2000/elasticsearch,bawse/elasticsearch,maddin2016/elasticsearch,trangvh/elasticsearch,mjason3/elasticsearch,JervyShi/elasticsearch,a2lin/elasticsearch,HonzaKral/elasticsearch,winstonewert/elasticsearch,sreeramjayan/elasticsearch,wangtuo/elasticsearch,a2lin/elasticsearch,jprante/elasticsearch,wuranbo/elasticsearch,nazarewk/elasticsearch,awislowski/elasticsearch,brandonkearby/elasticsearch,JackyMai/elasticsearch,brandonkearby/elasticsearch,robin13/elasticsearch,Shepard1212/elasticsearch,i-am-Nathan/elasticsearch,JackyMai/elasticsearch,strapdata/elassandra5-rc,girirajsharma/elasticsearch,MisterAndersen/elasticsearch,vroyer/elassandra,Shepard1212/elasticsearch,MaineC/elasticsearch,rlugojr/elasticsearch,i-am-Nathan/elasticsearch,camilojd/elasticsearch,avikurapati/elasticsearch,fforbeck/elasticsearch,a2lin/elasticsearch,scorpionvicky/elasticsearch,MisterAndersen/elasticsearch,gfyoung/elasticsearch,qwerty4030/elasticsearch,gfyoung/elasticsearch,uschindler/elasticsearch,nezirus/elasticsearch,bawse/elasticsearch,nomoa/elasticsearch,kalimatas/elasticsearch,palecur/elasticsearch,kalimatas/elasticsearch,LeoYao/elasticsearch,ZTE-PaaS/elasticsearch,s1monw/elasticsearch,winstonewert/elasticsearch,jimczi/elasticsearch,pozhidaevak/elasticsearch,MaineC/elasticsearch,mikemccand/elasticsearch,strapdata/elassandra5-rc,GlenRSmith/elasticsearch,dongjoon-hyun/elasticsearch,robin13/elasticsearch,myelin/elasticsearch,wangtuo/elasticsearch,jimczi/elasticsearch,qwerty4030/elasticsearch,scottsom/elasticsearch,bawse/elasticsearch,sreeramjayan/elasticsearch,strapdata/elassandra,henakamaMSFT/elasticsearch,liweinan0423/elasticsearch,njlawton/elasticsearch,rajanm/elasticsearch,fred84/elasticsearch,mjason3/elasticsearch,vroyer/elassandra,ThiagoGarciaAlves/elasticsearch,kalimatas/elasticsearch,camilojd/elasticsearch,elasticdog/elasticsearch,strapdata/elassandra,wenpos/elasticsearch,JSCooke/elasticsearch,masaruh/elasticsearch,StefanGor/elasticsearch,wangtuo/elasticsearch,StefanGor/elasticsearch,gingerwizard/elasticsearch,wangtuo/elasticsearch,naveenhooda2000/elasticsearch,sneivandt/elasticsearch,henakamaMSFT/elasticsearch,fred84/elasticsearch,shreejay/elasticsearch,ZTE-PaaS/elasticsearch,rajanm/elasticsearch,geidies/elasticsearch,nezirus/elasticsearch,umeshdangat/elasticsearch,strapdata/elassandra,gmarz/elasticsearch,mikemccand/elasticsearch,ricardocerq/elasticsearch,kalimatas/elasticsearch,glefloch/elasticsearch,artnowo/elasticsearch,markwalkom/elasticsearch,glefloch/elasticsearch,ZTE-PaaS/elasticsearch,dpursehouse/elasticsearch,nilabhsagar/elasticsearch,Stacey-Gammon/elasticsearch,mortonsykes/elasticsearch,i-am-Nathan/elasticsearch,trangvh/elasticsearch,obourgain/elasticsearch,C-Bish/elasticsearch,JSCooke/elasticsearch,nomoa/elasticsearch,IanvsPoplicola/elasticsearch,artnowo/elasticsearch,MaineC/elasticsearch,liweinan0423/elasticsearch,nilabhsagar/elasticsearch,cwurm/elasticsearch,coding0011/elasticsearch,GlenRSmith/elasticsearch,njlawton/elasticsearch,vroyer/elasticassandra,gingerwizard/elasticsearch,markwalkom/elasticsearch,LewayneNaidoo/elasticsearch,MisterAndersen/elasticsearch,ricardocerq/elasticsearch,zkidkid/elasticsearch,alexshadow007/elasticsearch,MisterAndersen/elasticsearch,fernandozhu/elasticsearch,ThiagoGarciaAlves/elasticsearch,HonzaKral/elasticsearch,mohit/elasticsearch,nezirus/elasticsearch,palecur/elasticsearch,geidies/elasticsearch,brandonkearby/elasticsearch,pozhidaevak/elasticsearch,strapdata/elassandra,rajanm/elasticsearch,mikemccand/elasticsearch,jprante/elasticsearch,fernandozhu/elasticsearch,ThiagoGarciaAlves/elasticsearch,henakamaMSFT/elasticsearch,nomoa/elasticsearch,gmarz/elasticsearch,yanjunh/elasticsearch,wuranbo/elasticsearch,jprante/elasticsearch,myelin/elasticsearch,nomoa/elasticsearch,rlugojr/elasticsearch,zkidkid/elasticsearch,Helen-Zhao/elasticsearch,mjason3/elasticsearch,bawse/elasticsearch,geidies/elasticsearch,jimczi/elasticsearch,brandonkearby/elasticsearch,vroyer/elasticassandra,zkidkid/elasticsearch,gmarz/elasticsearch,pozhidaevak/elasticsearch,robin13/elasticsearch,coding0011/elasticsearch,palecur/elasticsearch,njlawton/elasticsearch,StefanGor/elasticsearch,lks21c/elasticsearch,pozhidaevak/elasticsearch,ZTE-PaaS/elasticsearch,JervyShi/elasticsearch,markwalkom/elasticsearch,uschindler/elasticsearch,elasticdog/elasticsearch,fred84/elasticsearch,girirajsharma/elasticsearch,rajanm/elasticsearch,avikurapati/elasticsearch,gingerwizard/elasticsearch,fforbeck/elasticsearch,spiegela/elasticsearch,s1monw/elasticsearch,obourgain/elasticsearch,Shepard1212/elasticsearch,geidies/elasticsearch,markwalkom/elasticsearch,C-Bish/elasticsearch,masaruh/elasticsearch,dongjoon-hyun/elasticsearch,Stacey-Gammon/elasticsearch,dongjoon-hyun/elasticsearch,artnowo/elasticsearch,avikurapati/elasticsearch,coding0011/elasticsearch,cwurm/elasticsearch,nknize/elasticsearch,njlawton/elasticsearch,zkidkid/elasticsearch,shreejay/elasticsearch,umeshdangat/elasticsearch,dpursehouse/elasticsearch,palecur/elasticsearch,qwerty4030/elasticsearch,sreeramjayan/elasticsearch,i-am-Nathan/elasticsearch,masaruh/elasticsearch,scorpionvicky/elasticsearch,artnowo/elasticsearch,liweinan0423/elasticsearch,camilojd/elasticsearch,nomoa/elasticsearch,scorpionvicky/elasticsearch,Helen-Zhao/elasticsearch,obourgain/elasticsearch,ZTE-PaaS/elasticsearch,spiegela/elasticsearch,nazarewk/elasticsearch,HonzaKral/elasticsearch,mohit/elasticsearch,zkidkid/elasticsearch,nezirus/elasticsearch,scottsom/elasticsearch,maddin2016/elasticsearch,winstonewert/elasticsearch,JSCooke/elasticsearch,markwalkom/elasticsearch,umeshdangat/elasticsearch,wangtuo/elasticsearch,trangvh/elasticsearch,JervyShi/elasticsearch,nazarewk/elasticsearch,glefloch/elasticsearch,winstonewert/elasticsearch,rlugojr/elasticsearch,JervyShi/elasticsearch,umeshdangat/elasticsearch,dpursehouse/elasticsearch,Stacey-Gammon/elasticsearch,maddin2016/elasticsearch,elasticdog/elasticsearch,Shepard1212/elasticsearch,gfyoung/elasticsearch,sneivandt/elasticsearch,LeoYao/elasticsearch,glefloch/elasticsearch,fforbeck/elasticsearch,rlugojr/elasticsearch,dongjoon-hyun/elasticsearch,lks21c/elasticsearch,sreeramjayan/elasticsearch,fernandozhu/elasticsearch,myelin/elasticsearch,fforbeck/elasticsearch,wenpos/elasticsearch,mohit/elasticsearch,mortonsykes/elasticsearch,shreejay/elasticsearch,alexshadow007/elasticsearch,masaruh/elasticsearch,glefloch/elasticsearch,trangvh/elasticsearch,girirajsharma/elasticsearch,artnowo/elasticsearch,LewayneNaidoo/elasticsearch,cwurm/elasticsearch,sneivandt/elasticsearch,Helen-Zhao/elasticsearch,IanvsPoplicola/elasticsearch,JervyShi/elasticsearch,uschindler/elasticsearch,LewayneNaidoo/elasticsearch,nezirus/elasticsearch,sneivandt/elasticsearch,strapdata/elassandra5-rc,scottsom/elasticsearch,naveenhooda2000/elasticsearch,girirajsharma/elasticsearch,naveenhooda2000/elasticsearch,jprante/elasticsearch,JSCooke/elasticsearch,henakamaMSFT/elasticsearch,Stacey-Gammon/elasticsearch,robin13/elasticsearch,yanjunh/elasticsearch,pozhidaevak/elasticsearch,maddin2016/elasticsearch,gmarz/elasticsearch,MisterAndersen/elasticsearch,wuranbo/elasticsearch,a2lin/elasticsearch,mjason3/elasticsearch,henakamaMSFT/elasticsearch,coding0011/elasticsearch,naveenhooda2000/elasticsearch,liweinan0423/elasticsearch,fernandozhu/elasticsearch,ThiagoGarciaAlves/elasticsearch,nknize/elasticsearch,ThiagoGarciaAlves/elasticsearch,a2lin/elasticsearch,LeoYao/elasticsearch,masaruh/elasticsearch,fernandozhu/elasticsearch,avikurapati/elasticsearch,wur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