Ajay | Group field items have parent field code as ES field name prefix
Revert "DC/Melanie | #3837 | Prefixing es keys for questions inside groups with group name"

This reverts commit 5f75f8d6bc13741a0916b287ecb80840f60b1b2a.
Merge remote-tracking branch 'origin/dup_group_item' into develop