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How to use Java Time in different frameworks? This article shares examples in Java concurrency classes, Jackson, Akka, and Elasticsearch.

This article explains the 18 allocation deciders in Elasticsearch: when they decide to allow, deny, or throttle the shard allocation under different circumstances. Also, a complete list of messages for unassigned shards.

Explain the common Elasticsearch exceptions occurred when indexing new documents, with sample messages, analysis, suggestions and external resources for further investigation.

Basic information about garbage collection (GC) in Elasticsearch, including the default garbage collector used, JVM options, GC logging, and more.

How does discovery work in Elasticsearch? This article explains different mechanisms of discovery, the key settings, fault detection, related logs, and more.

Wrap Elasticsearch client response into CompletableFuture in Java for Elasticsearch transport client or Java high level REST client.

Release note of Vavr Jackson 1.0.0 Alpha 3.

Why do we need CompletableFuture? What is its strength compared to synchronous code and classic future in Java? How to remember its APIs?