Opster Team
Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many errors.
To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them. Take a self-guided product tour to see for yourself (no registration required).
This guide will help you check for common problems that cause the log ” Expected; but did not find; a dynamic hosts list at ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: discovery-azure-classic, discovery-file and hosts.

Log Context
Log “Expected; but did not find; a dynamic hosts list at [{}]” classname is FileBasedUnicastHostsProvider.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
deprecationLogger.deprecated("Found dynamic hosts list at [{}] but this path is deprecated. This list should be at [{}] " + "instead. Support for the deprecated path will be removed in future."; legacyUnicastHostsFilePath; unicastHostsFilePath); return readFileContents(legacyUnicastHostsFilePath); } logger.warn("expected; but did not find; a dynamic hosts list at [{}]"; unicastHostsFilePath); return Collections.emptyList(); } private ListreadFileContents(Path path) {
Find & fix Elasticsearch problems
Opster AutoOps diagnoses & fixes issues in Elasticsearch based on analyzing hundreds of metrics.
Fix Your Cluster IssuesConnect in under 2 minutes
Lourens Rozema
CTO at Omnidots