Elasticsearch

Distributed search and analytics engine, commonly run as the storage/query layer of the ELK stack for logs, flow data, and full-text search. Paired with Kibana for visualization (the ELK stack proper) and with Elastiflow for network flow analytics. When the job is purely storing/querying logs rather than general full-text search, Loki (paired with Grafana instead of Kibana) is the lighter-weight open-source alternative — it indexes only labels, not full log text, trading full-text search power for much lower storage/CPU cost.

Related

• Kibana
• Grafana
• Loki
• Elastiflow
• OpenSearch — Apache 2.0 fork, the natural open-source replacement candidate