paging only works up to 10.000 hits, due to elasticsearch limitation. provide hint to search differently then
https://textgridrep.org/search?start=9980&limit=20 works (500 pages with limit 20), but https://textgridrep.org/search?start=10000&limit=20 not. this is due to elasticsearch index.max_result_window
being set to 10.000. it is not recomended to rause that limit as "Search requests take heap memory and time proportional to from + size and this limits that memory"
so want to show a help page how to refine search (filters/facets/searchterms) if the last page is hit, and limit the pager to 10.000 (how much pages depends on the limit).
for crawlers we want to provide other ways to get all results in future, in the tgsearch api with e.g. scroll or point-in-time