From Fluent Builders to Broken Pits

The Story

Join us for a meetup right after **[Elastic{ON} Amsterdam](https://www.elastic.co/events/elasticon/amsterdam)**, **October 20th** in the **Beurs van Berlage** in Amsterdam! Doors open at 18.30 and the presentations begin at 18.45. **Important:** please note that this is a different venue than we normally have. **Address:** Beurs van Berlage, Damrak 243, Amsterdam **Agenda:** 18.30 Doors open, drinks, snacks and networking 18.45 From Fluent Builders to Broken Pits 19.15 Beyond the Query: Monitoring Elasticsearch-Powered Search with Elastic Observability 19.45 More networking 20.00 Wrap up **Talks:** **From Fluent Builders to Broken Pits** Migrating to Elasticsearch 8 & 9 highlighted how the modern elasticsearch-java client improves developer experience. Its fluent APIs, functional builders, and strong typing streamline work by turning IDE autocomplete into instant documentation and catching errors at compile time. We share practical lessons from our migration, examine what happens when you cross compatibility boundaries during 8.x upgrades, and walk through a deserialization edge case that prompted an unexpectedly wild GitHub Copilot workaround. Expect a practical look at API design, version evolution, and developer velocity. *Speaker: Hans Kruse, Software Engineer at KVK* **Beyond the Query: Monitoring Elasticsearch-Powered Search with Elastic Observability** In this session we look at how to keep your search stack healthy in production using Elastic Observability. We'll cover the signals that actually matter and how Elastic's own Integrations, APM, and SLOs turn those signals into action. You'll see how correlating application traces with cluster metrics and logs collapses time-to-root-cause, how out-of-the-box dashboards and alerting remove the need to build your own tooling, and how proactive monitoring turns 2am fire-drills into calm, data-driven conversations. A practical, demo-driven follow-up — this time from the other side of the search bar. *Speaker

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