group -> group_index

lua/cmp/config/sources.lua

@@ -2,7 +2,7 @@ return function(...)
   local sources = {}
   for i, group in ipairs({ ... }) do
     for _, source in ipairs(group) do
-      source.group = i
+      source.group_index = i
       table.insert(sources, source)
     end
   end