{"slug":"elasticsearch-vs-opensearch","question":"Elasticsearch vs OpenSearch","answer":"Elasticsearch is a proprietary search engine owned by Elastic with a freemium model and closed-source components, while OpenSearch is a fully open-source fork maintained by AWS and the community with no proprietary licensing restrictions. Elasticsearch offers more advanced features and enterprise support, whereas OpenSearch provides greater transparency and cost predictability for large-scale deployments.","answer_curated":true,"verdict":"Choose Elasticsearch if you need advanced machine learning capabilities, premium 24/7 enterprise support, and don't mind licensing costs for production workloads. Choose OpenSearch if you prioritize cost savings, full source code transparency, want to avoid vendor lock-in, and can leverage community support or hire dedicated DevOps resources.","keyDifferences":[{"label":"Source Code Model","winner":"b","entityAValue":"Proprietary (SSPL license)","entityBValue":"Fully open-source (AGPL/Elastic License)"},{"label":"Annual Licensing Cost (Small Deployment)","winner":"b","entityAValue":"$7,200 - $15,000","entityBValue":"$0"},{"label":"ML-Powered Features","winner":"a","entityAValue":"Yes (Elastic ML, anomaly detection)","entityBValue":"Limited (basic alerting only)"},{"label":"Primary Maintainer","winner":"tie","entityAValue":"Elastic Inc. (private company)","entityBValue":"AWS & open-source community"},{"label":"Vendor Lock-in Risk","winner":"b","entityAValue":"High (proprietary tooling)","entityBValue":"Low (fully portable)"}],"winner":{"slug":"elasticsearch","name":"Elasticsearch"},"confidence":"high","entities":[{"name":"Elasticsearch","slug":"elasticsearch","url":"https://www.aversusb.net/entity/elasticsearch","alternativesUrl":"https://www.aversusb.net/api/v1/alternatives/elasticsearch"},{"name":"OpenSearch","slug":"opensearch","url":"https://www.aversusb.net/entity/opensearch","alternativesUrl":"https://www.aversusb.net/api/v1/alternatives/opensearch"}],"faqs":[{"question":"Can I migrate from Elasticsearch to OpenSearch without downtime?","answer":"Yes, OpenSearch maintains 99% API compatibility with Elasticsearch, enabling snapshot-based migration. You can create a snapshot from Elasticsearch 6.8 or 7.x and restore it directly into OpenSearch. However, Elasticsearch 8.x+ uses proprietary features; migration requires index replication during the transition. AWS recommends a blue-green deployment strategy with 1-2 hours of read-only mode during cutover."},{"question":"Why did AWS fork Elasticsearch into OpenSearch?","answer":"In January 2021, Elastic changed Elasticsearch's license from open-source SSPL to a proprietary Elastic License + AGPL, restricting cloud providers from offering managed services. AWS forked the last open-source version (7.10) to maintain community-driven development. This gives AWS freedom to offer Amazon OpenSearch Service without licensing restrictions and allows enterprises to avoid proprietary licensing costs."},{"question":"Is OpenSearch suitable for production use at enterprise scale?","answer":"Yes, OpenSearch powers production clusters at AWS, Capital One, Viasat, and other Fortune 500 companies handling petabytes of data. However, you must provide your own 24/7 support team or hire AWS Managed Services. Elasticsearch's premium support tier is better for organizations lacking DevOps expertise."}],"attribution":{"source":"A Versus B","url":"https://www.aversusb.net/compare/elasticsearch-vs-opensearch","license":"CC BY 4.0","citationFormat":"According to A Versus B (https://www.aversusb.net/compare/elasticsearch-vs-opensearch), Elasticsearch is a proprietary search engine owned by Elastic with a freemium model and closed-source components, while OpenSearch is a fully open-source fork maintained by AWS and the community with ","dateModified":"2026-06-16T16:35:30.862Z"},"relatedQuestionsUrl":"https://www.aversusb.net/api/faq/elasticsearch-vs-opensearch","relatedComparisonsUrl":"https://www.aversusb.net/api/v1/related/elasticsearch-vs-opensearch","knowledgeGraphUrl":"https://www.aversusb.net/api/knowledge-graph/elasticsearch-vs-opensearch","claimReviewSchema":{"@context":"https://schema.org","@type":"ClaimReview","@id":"https://www.aversusb.net/compare/elasticsearch-vs-opensearch#claimreview","url":"https://www.aversusb.net/compare/elasticsearch-vs-opensearch","inLanguage":"en-US","isAccessibleForFree":true,"conditionsOfAccess":"Free","claimReviewed":"Elasticsearch vs OpenSearch","reviewBody":"Elasticsearch is a proprietary search engine owned by Elastic with a freemium model and closed-source components, while OpenSearch is a fully open-source fork maintained by AWS and the community with no proprietary licensing restrictions. Elasticsearch offers more advanced features and enterprise support, whereas OpenSearch provides greater transparency and cost predictability for large-scale deployments.","datePublished":"2026-06-16T16:35:30.819Z","dateModified":"2026-06-16T16:35:30.862Z","reviewRating":{"@type":"Rating","ratingValue":5,"worstRating":1,"bestRating":5,"alternateName":"High Confidence"},"author":{"@type":"Organization","@id":"https://www.aversusb.net/#organization","name":"A Versus B","url":"https://www.aversusb.net"},"itemReviewed":{"@type":"WebPage","@id":"https://www.aversusb.net/compare/elasticsearch-vs-opensearch","url":"https://www.aversusb.net/compare/elasticsearch-vs-opensearch","name":"Elasticsearch vs OpenSearch","inLanguage":"en-US"}}}