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.
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This guide will help you check for common problems that cause the log ” Value for setting is too low. This can result in data loss! Please set it to at least a quorum of master- ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: discovery-azure-classic and elect.

Log Context
Log “Value for setting {} is too low. This can result in data loss! Please set it to at least a quorum of master-” classname is ElectMasterService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
} public void logMinimumMasterNodesWarningIfNecessary(ClusterState oldState; ClusterState newState) { // check if min_master_nodes setting is too low and log warning if (hasTooManyMasterNodes(oldState.nodes()) == false && hasTooManyMasterNodes(newState.nodes())) { logger.warn("value for setting \"{}\"" is too low. This can result in data loss! Please set it to at least a quorum of master-"" +
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Billy McCarthy
Senior SysAdmin at Backblaze