could not be solr able to close oldest warming searcher and replace it by new one?That approach can easily lead to starvation (i.e. you never get a new searcher usable for queries).
It will not. If there is more then 1 warming searcher. Look at this schema:
1. current in use searcher 2. 1st warming searcher 3. 2nd warming searcher if new warming searcher is needed, close (3) and create a new one (3). (2) will finish work uninterrupted and it will replace (1)
