This flag indicates whether there are more results available on the
next pages. It is needed in cases when the total number of search
results is not known in advance.
Also, in such cases there's no `count` field in responses anymore
because responding with `0` was confusing for clients: it's not possible
to differentiate between "there are no results" and "we don't know how
much".
Co-authored-by: Thales Macedo Garitezi <thalesmg@gmail.com>
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