Architecture: Remove the separate executor service and roll it into the index service. #216
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The primary motivation for this is that in production, the large number of partitioned services has lead to an intermittent exhaustion of available database connections, as each service has a connection pool.
The decision to have a separate executor service dates back from when the index service was very slow to start, and the executor didn't always spin off its memory-hungry tasks into separate processes, which meant the executor would sometimes OOM and crash, and it was undesirable to bring the index down with it.