Elasticsearch

Index a realistic sample of your documents in Elasticsearch, including messy text and common filters. Write representative queries and judge whether top results are relevant, not merely fast. Then measure indexing throughput, memory use, and query latency while data is changing.

Plan mappings, retention, snapshots, and access controls before migration. Search clusters need regular maintenance and a restore path. Use measured relevance and operating cost to decide whether a simpler index or database search would meet the need.