TaskExecutor
Executor wrapper responsible for the execution of concurrent tasks. Used to parallelize search across segments as well as query rewrite in some cases. Exposes a single .invokeAll method that takes a collection of Callables and executes them concurrently. Once all but one task have been submitted to the executor, it tries to run as many tasks as possible on the calling thread, then waits for all tasks that have been executed in parallel on the executor to be completed and then returns a list with the obtained results.
Functions
Execute all the callables provided as an argument, wait for them to complete and return the obtained results. If an exception is thrown by more than one callable, the subsequent ones will be added as suppressed exceptions to the first one that was caught. Additionally, if one task throws an exception, all other tasks from the same group are cancelled, to avoid needless computation as their results would not be exposed anyways.