The document discusses migrating job search data from MySQL to Elasticsearch to improve performance. The MySQL queries for job searches were slow, with some over 2 seconds. Testing showed Elasticsearch queries were faster at 0.5 seconds. The first phase of migration moved 160,000 job records to Elasticsearch. Performance tuning included adjusting thread pools, memory settings, and hardware. Monitoring and failure testing were conducted before migration. Latency for job searches improved greatly after migrating to Elasticsearch.