Revert "Pass active backend to index queryset calls (closes #534)"

This reverts commit c5e0ce5221fc97f6a9a6fd9d6b6fad6aec960842.
Revert "rollback"

This reverts commit 09cfe2be1018dddb9de12ba28172be5de53ebe44.
Revert "Revert "rollback""

This reverts commit 2d2f9fda48ba7a7038c6ef22c7a17599025ea3a4.