64b31f44af
Replicated closed indices can't be indexed into or searched, and therefore don't need a shard with full indexing and search capabilities allocated. We can save on a lot of heap memory for those indices by not allocating a mapper service and caching infrastructure (which preallocates a constant amount per instance). Before this change, a 1GB ES instance could host 250 replicated closed metricbeat indices (each index with one shard). After this change, the same instance can host 7300 replicated closed metricbeat instances (not that this would be a recommended configuration). Most of the remaining memory is in the cluster state and the IndexSettings object. |
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