98c91a3bd0
This is a protection mechanism to prevent a single search request from hitting a large number of shards in the cluster concurrently. If a search is executed against all indices in the cluster this can easily overload the cluster causing rejections etc. which is not necessarily desirable. Instead this PR adds a per request limit of `max_concurrent_shard_requests` that throttles the number of concurrent initial phase requests to `256` by default. This limit can be increased per request and protects single search requests from overloading the cluster. Subsequent PRs can introduces addiontional improvemetns ie. limiting this on a `_msearch` level, making defaults a factor of the number of nodes or sort shards iters such that we gain the best concurrency across nodes. |
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