Profiling and Slow Query Logs
Diagnose performance problems by profiling individual queries and capturing slow operations with the slow log so you can find and fix the real bottlenecks.
Measure Before You Optimize
Guessing at performance fixes wastes time. Elasticsearch gives you two precise tools: the Profile API for dissecting a single query, and slow logs for catching expensive operations in production.
The Profile API
Add "profile": true to any search request. Elasticsearch returns a detailed timing breakdown of how the query executed on each shard.
GET my_index/_search
{
"profile": true,
"query": { "match": { "title": "elasticsearch" } }
}All lessons in this course
- Query Optimization Strategies
- Indexing Performance Best Practices
- Caching and Concurrency
- Profiling and Slow Query Logs