Elasticsearch vs Splunk
Elasticsearch: Lucene-based distributed search and analytics engine for text, vectors, logs and metrics. Splunk: Machine-data indexing and search platform with schema-on-read SPL queries, now owned by Cisco.
key differences
- Licensing: Elasticsearch is open source (copyleft) (AGPL-3.0, SSPL 1.0 or Elastic License 2.0 (your choice)); Splunk is proprietary (Proprietary commercial license).
- Elasticsearch is built for larger datasets (Multi-PB) than Splunk (≤ 1 PB).
- Transactions: Elasticsearch offers limited ACID; Splunk offers none.
- Only Elasticsearch has joins, secondary indexes, vector search, geospatial, json.
- Only Splunk has ttl / expiry.
- Elasticsearch has a serverless option; Splunk does not.
choose elasticsearch for
- +E-commerce and site search with faceting
- +Log, metrics and SIEM analytics
- +Hybrid keyword plus semantic retrieval for RAG
- +Geospatial search and aggregations
best at · Search, Vector search, RAG
choose splunk for
- +Security information and event management (SIEM)
- +Centralised log search and alerting
- +IT operations monitoring and incident investigation
- +Compliance reporting over machine data
best at · Observability, Search, Time-series
Elasticsearch vs Splunk: FAQ
What is the difference between Elasticsearch and Splunk?
Elasticsearch: Lucene-based distributed search and analytics engine for text, vectors, logs and metrics. Splunk: Machine-data indexing and search platform with schema-on-read SPL queries, now owned by Cisco. Licensing: Elasticsearch is open source (copyleft) (AGPL-3.0, SSPL 1.0 or Elastic License 2.0 (your choice)); Splunk is proprietary (Proprietary commercial license). Elasticsearch is built for larger datasets (Multi-PB) than Splunk (≤ 1 PB). Transactions: Elasticsearch offers limited ACID; Splunk offers none.
When should I choose Elasticsearch over Splunk?
Choose Elasticsearch for E-commerce and site search with faceting; log, metrics and SIEM analytics; and hybrid keyword plus semantic retrieval for RAG. Choose Splunk for security information and event management (SIEM); centralised log search and alerting; and IT operations monitoring and incident investigation.
Is Elasticsearch or Splunk more popular?
Elasticsearch ranks #6 on the WhichDB Score (75.1/100) and Splunk ranks #31 (48.1/100). Popularity is not fit: check the requirements that matter for your project.
Are Elasticsearch and Splunk open source?
Yes. Elasticsearch is open source. License: AGPL-3.0, SSPL 1.0 or Elastic License 2.0 (your choice). No. Splunk is proprietary, closed-source software.