v6.1.12

* Issue **#1824** : Fix for search hang when extraction is requested but no search pipeline is provided.

* Issue **#1083** : Added `any()`, `first()`, `last()`, `nth()`, `top()` and `bottom()` selection functions to select child values of grouped items.

* Issue **#1837** : Added `joining()` function to concatenate supplied fields in child rows.

* Issue **#1784** : Several functions were previously prevented from working on results from aggregate functions but are now applied regardless.