This change simplifies and removes the DisjunctionSearcher.currentID
tracking, and instead utilizes the the matching/matchingIdxs slices
for tracking the required information.
As the core of the optimization, the previous code used two loop
passses to compare the internal ID's to the currentID field. This
commit instead optimizes to have a single pass to both compare the
internalID's and to also maintain the matching/matchingIdxs arrays.
On my dev box, using a bleve-query benchmark on a wiki dataset, with
query-string of "text:afternoon text:coffee", the previous code had
throughput of 958qps, and this commit has 1174qps.
e344582021