and max heap are equal File descriptor check - file descriptors are set to at least 65,536 Memory lock check - Bootstrap.memory_lock is set Maximum number of threads check - Allow elasticsearch process to create at least 2048 threads Maximum size virtual memory check - Allow unlimited address space for elasticsearch process Maximum map count check - sysctl -w vm.max_map_count=262144 Client JVM check - Make sure server JVM is running, not the client JVM Use serial collector check - Make sure -XX:+UseSerialGC is enabled System call filter check - Make sure system call filters are installed and enabled OnError and OnOutOfMemoryError checks - Disallow these settings when syscall filters are enabled Early-access check Disallow use of openJDK early access builds G1GC check - Disallow use of G1GC