{"slug":"elasticsearch-vs-opensearch","title":"Elasticsearch vs OpenSearch","url":"https://www.aversusb.net/compare/elasticsearch-vs-opensearch","faqCount":5,"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."},{"question":"What machine learning features does OpenSearch lack?","answer":"OpenSearch lacks Elasticsearch's ML suite: no anomaly detection, forecasting, or automated alerting. However, OpenSearch supports plugins for basic alerting and anomaly detection via third-party tools like OpenSearch Anomaly Detection plugin (community-maintained). For real-time ML workloads, Elasticsearch ML is significantly more mature with production-grade algorithms."},{"question":"How much can switching to OpenSearch save on licensing?","answer":"Elasticsearch Gold tier costs $7,200/year minimum plus additional per-node fees. A mid-sized cluster (10 nodes) costs $15,000-$25,000 annually. OpenSearch has zero licensing costs but may require 1-2 dedicated DevOps engineers ($150k-$200k annually). Organizations with existing DevOps talent save $15,000-$25,000/year; those hiring new staff break even or lose money."}],"faqPageSchema":{"@context":"https://schema.org","@type":"FAQPage","@id":"https://www.aversusb.net/compare/elasticsearch-vs-opensearch#faq","url":"https://www.aversusb.net/compare/elasticsearch-vs-opensearch","inLanguage":"en-US","name":"Elasticsearch vs OpenSearch — FAQ","description":"Frequently asked questions about Elasticsearch vs OpenSearch","dateModified":"2026-06-16T16:35:30.862Z","author":{"@type":"Organization","@id":"https://www.aversusb.net/#organization","name":"A Versus B"},"publisher":{"@type":"Organization","@id":"https://www.aversusb.net/#organization","name":"A Versus B"},"isPartOf":{"@type":"Article","@id":"https://www.aversusb.net/compare/elasticsearch-vs-opensearch#article"},"license":"https://creativecommons.org/licenses/by/4.0/","speakable":{"@type":"SpeakableSpecification","@id":"https://www.aversusb.net/compare/elasticsearch-vs-opensearch#faq-speakable","cssSelector":[".faq-answer"]},"mainEntity":[{"@type":"Question","@id":"https://www.aversusb.net/compare/elasticsearch-vs-opensearch#q1","name":"Can I migrate from Elasticsearch to OpenSearch without downtime?","answerCount":1,"acceptedAnswer":{"@type":"Answer","@id":"https://www.aversusb.net/compare/elasticsearch-vs-opensearch#a1","text":"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.","inLanguage":"en-US","url":"https://www.aversusb.net/compare/elasticsearch-vs-opensearch","upvoteCount":1,"author":{"@type":"Organization","@id":"https://www.aversusb.net/#organization","name":"A Versus B"}}},{"@type":"Question","@id":"https://www.aversusb.net/compare/elasticsearch-vs-opensearch#q2","name":"Why did AWS fork Elasticsearch into OpenSearch?","answerCount":1,"acceptedAnswer":{"@type":"Answer","@id":"https://www.aversusb.net/compare/elasticsearch-vs-opensearch#a2","text":"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.","inLanguage":"en-US","url":"https://www.aversusb.net/compare/elasticsearch-vs-opensearch","upvoteCount":1,"author":{"@type":"Organization","@id":"https://www.aversusb.net/#organization","name":"A Versus B"}}},{"@type":"Question","@id":"https://www.aversusb.net/compare/elasticsearch-vs-opensearch#q3","name":"Is OpenSearch suitable for production use at enterprise scale?","answerCount":1,"acceptedAnswer":{"@type":"Answer","@id":"https://www.aversusb.net/compare/elasticsearch-vs-opensearch#a3","text":"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.","inLanguage":"en-US","url":"https://www.aversusb.net/compare/elasticsearch-vs-opensearch","upvoteCount":1,"author":{"@type":"Organization","@id":"https://www.aversusb.net/#organization","name":"A Versus B"}}},{"@type":"Question","@id":"https://www.aversusb.net/compare/elasticsearch-vs-opensearch#q4","name":"What machine learning features does OpenSearch lack?","answerCount":1,"acceptedAnswer":{"@type":"Answer","@id":"https://www.aversusb.net/compare/elasticsearch-vs-opensearch#a4","text":"OpenSearch lacks Elasticsearch's ML suite: no anomaly detection, forecasting, or automated alerting. However, OpenSearch supports plugins for basic alerting and anomaly detection via third-party tools like OpenSearch Anomaly Detection plugin (community-maintained). For real-time ML workloads, Elasticsearch ML is significantly more mature with production-grade algorithms.","inLanguage":"en-US","url":"https://www.aversusb.net/compare/elasticsearch-vs-opensearch","upvoteCount":1,"author":{"@type":"Organization","@id":"https://www.aversusb.net/#organization","name":"A Versus B"}}},{"@type":"Question","@id":"https://www.aversusb.net/compare/elasticsearch-vs-opensearch#q5","name":"How much can switching to OpenSearch save on licensing?","answerCount":1,"acceptedAnswer":{"@type":"Answer","@id":"https://www.aversusb.net/compare/elasticsearch-vs-opensearch#a5","text":"Elasticsearch Gold tier costs $7,200/year minimum plus additional per-node fees. A mid-sized cluster (10 nodes) costs $15,000-$25,000 annually. OpenSearch has zero licensing costs but may require 1-2 dedicated DevOps engineers ($150k-$200k annually). Organizations with existing DevOps talent save $15,000-$25,000/year; those hiring new staff break even or lose money.","inLanguage":"en-US","url":"https://www.aversusb.net/compare/elasticsearch-vs-opensearch","upvoteCount":1,"author":{"@type":"Organization","@id":"https://www.aversusb.net/#organization","name":"A Versus B"}}}]}}