Elasticsearch (ES) advanced configuration allows you to fine-tune performance, security, and cluster behavior. Here are key areas to explore:

1. Cluster Configuration 🌐

  • Cluster Name: Set via cluster.name in elasticsearch.yml
  • Discovery Settings: Configure seed hosts with discovery.seed_hosts
  • Bootstrap Checks: Disable with bootstrap.check_only (not recommended for production)
elasticsearch_cluster_config

2. Index Settings 🔧

  • Number of Shards: Optimize based on data volume (index.number_of_shards)
  • Refresh Interval: Adjust with index.refresh_interval for real-time vs. batch use
  • Mapping Customization: Define custom data types in mapping section
elasticsearch_index_tuning

3. Security Enhancements ⚙️

  • SSL/TLS: Enable via xpack.security.transport.ssl.enabled
  • Authentication: Configure xpack.security.authc.realms for LDAP/ActiveDirectory
  • Role-Based Access: Define roles in elasticsearch.yml or via API
elasticsearch_security_settings

4. Performance Tuning 📈

  • Thread Pool: Adjust thread_pool settings for specific operations
  • Memory Allocation: Set ES_HEAP_SIZE in JVM options
  • Query Optimization: Use indices.query.bool.max_clause_count to avoid syntax errors

For deeper insights, check our official documentation or configuration reference. 📖

🚨 Note: Always back up your elasticsearch.yml before making changes.