refactor(search/elastic): Allow rebuilder classes to be swapped
refactor(search/elastic): Allow rebuilder classes to be swapped

wagtail/wagtail,nilnvoid/wagtail,rsalmaso/wagtail,thenewguy/wagtail,torchbox/wagtail,Toshakins/wagtail,kurtrwall/wagtail,chrxr/wagtail,nutztherookie/wagtail,nimasmi/wagtail,kurtw/wagtail,nutztherookie/wagtail,thenewguy/wagtail,mixxorz/wagtail,wagtail/wagtail,nutztherookie/wagtail,kaedroho/wagtail,inonit/wagtail,quru/wagtail,mixxorz/wagtail,inonit/wagtail,nealtodd/wagtail,mixxorz/wagtail,nutztherookie/wagtail,kaedroho/wagtail,takeflight/wagtail,hamsterbacke23/wagtail,gasman/wagtail,gogobook/wagtail,quru/wagtail,zerolab/wagtail,gasman/wagtail,inonit/wagtail,chrxr/wagtail,mikedingjan/wagtail,davecranwell/wagtail,FlipperPA/wagtail,zerolab/wagtail,iansprice/wagtail,hamsterbacke23/wagtail,JoshBarr/wagtail,gasman/wagtail,nimasmi/wagtail,gogobook/wagtail,kaedroho/wagtail,JoshBarr/wagtail,gasman/wagtail,mikedingjan/wagtail,torchbox/wagtail,chrxr/wagtail,gasman/wagtail,quru/wagtail,kaedroho/wagtail,kurtw/wagtail,JoshBarr/wagtail,zerolab/wagtail,rsalmaso/wagtail,takeflight/wagtail,kurtrwall/wagtail,jnns/wagtail,timorieber/wagtail,takeflight/wagtail,gogobook/wagtail,kaedroho/wagtail,nealtodd/wagtail,torchbox/wagtail,hamsterbacke23/wagtail,nealtodd/wagtail,davecranwell/wagtail,FlipperPA/wagtail,davecranwell/wagtail,jnns/wagtail,mixxorz/wagtail,Toshakins/wagtail,nilnvoid/wagtail,thenewguy/wagtail,timorieber/wagtail,thenewguy/wagtail,rsalmaso/wagtail,thenewguy/wagtail,nimasmi/wagtail,rsalmaso/wagtail,wagtail/wagtail,jnns/wagtail,FlipperPA/wagtail,davecranwell/wagtail,timorieber/wagtail,inonit/wagtail,kurtrwall/wagtail,jnns/wagtail,kurtrwall/wagtail,wagtail/wagtail,quru/wagtail,nimasmi/wagtail,nealtodd/wagtail,zerolab/wagtail,timorieber/wagtail,wagtail/wagtail,chrxr/wagtail,mikedingjan/wagtail,gogobook/wagtail,JoshBarr/wagtail,FlipperPA/wagtail,mikedingjan/wagtail,iansprice/wagtail,nilnvoid/wagtail,iansprice/wagtail,kurtw/wagtail,hamsterbacke23/wagtail,nilnvoid/wagtail,Toshakins/wagtail,zerolab/wagtail,Toshakins/wagtail,iansprice/wagtail,takeflight/wagtail,rsalmaso/wagtail,torchbox/wagtail,kurtw/wagtail,mixxorz/wagtail