Add OS-level performance tuning for Elasticsearch#113
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Adds an elasticsearch_os_tuning toggle (default: true) that applies production-required sysctl settings: - vm.max_map_count=262144 (required for mmapfs, ES refuses to start) - vm.swappiness=1 (prevent heap from being swapped) - net.ipv4.tcp_retries2=5 (faster fault detection, ~13s vs ~15min) - Transparent Huge Pages disabled (runtime + persistent via tmpfiles) The THP disable uses failed_when: false for containers where sysfs is read-only. Verify assertions added to elasticsearch_default scenario. Closes #60
The sysctl and THP tasks fail in Docker/LXC containers because the kernel tunables are read-only in unprivileged containers. Skip these tasks when virtualization_type indicates a container runtime, and guard the verify assertions accordingly.
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Adds sysctl settings required for production Elasticsearch: vm.max_map_count, vm.swappiness, TCP retries, and THP disable. Controlled by elasticsearch_os_tuning (default: true). Test coverage in elasticsearch_default scenario.
Closes #60