hack(algolia): (almost) don't query posts index twice

site/search/SearchPanel.tsx

@@ -560,6 +560,13 @@ export class InstantSearchContainer extends React.Component {
                 searchClient={this.searchClient}
                 indexName={getIndexName(SearchIndexName.Pages)}
             >
+                {/*
+                We query `Pages` two times, once here and once in the <Index> component inside <SearchResults.
+                That's not great; but Algolia pretty much always needs a root-level index to work with - otherwise
+                some things like `scopedResults` don't work. See https://github.com/algolia/instantsearch/issues/6132.
+                We at least configure the root-level index to have `hitsPerPage={0}` so that it doesn't actually return any hits.
+                 */}
+                <Configure hitsPerPage={0} />
                 <div className="search-panel">
                     <SearchBox
                         placeholder={DEFAULT_SEARCH_PLACEHOLDER}