This API (unexported) will estimate the amount of memory needed to execute
a search query over an index before the collector begins data collection.
Sample estimates for certain queries:
{Size: 10, BenchmarkUpsidedownSearchOverhead}
ESTIMATE BENCHMEM
TermQuery 4616 4796
MatchQuery 5210 5405
DisjunctionQuery (Match queries) 7700 8447
DisjunctionQuery (Term queries) 6514 6591
ConjunctionQuery (Match queries) 7524 8175
Nested disjunction query (disjunction of disjunctions) 10306 10708
…
On a couple of micro benchmarks on a dev macbook using bleve-query on
an index of 50K wikipedia docs, scorch is now faster than
upsidedown/moss on high-freq term search "text:date"...
400 qps - upsidedown/moss
404 qps - scorch before
565 qps - scorch after
