CollectorManager
A manager of collectors. This class is useful to parallelize execution of search requests and has two main methods:
.newCollector which must return a NEW collector which will be used to collect a certain set of leaves.
.reduce which will be used to reduce the results of individual collections into a meaningful result. This method is only called after all leaves have been fully collected.
Note: Multiple LeafCollectors may be requested for the same [ ] via Collector.getLeafCollector across the different Collectors returned by .newCollector. Any computation or logic that needs to happen once per segment requires specific handling in the collector manager implementation, because the collection of an entire segment may be split across threads.
See also
Inheritors
Functions
Return a new Collector. This must return a different instance on each call.
Reduce the results of individual collectors into a meaningful result. For instance a [ ] would compute the top docs of each collector and then merge them using TopDocs.merge. This method must be called after collection is finished on all provided collectors.