default to elasticsearch backend
default to elasticsearch backend

jjardel/anthracite,nickman/anthracite,square-root/anthracite,square-root/anthracite,jjardel/anthracite,Dieterbe/anthracite,nickman/anthracite,square-root/anthracite,square-root/anthracite,jjardel/anthracite,nickman/anthracite,Dieterbe/anthracite,Dieterbe/anthracite,jjardel/anthracite,nickman/anthracite,Dieterbe/anthracite