Warnings contain the error message mentioned below.
EnterpriseVault.Indexing.EVElasticsearchClient.ElasticsearchException: Unable to create Elasticsearch client instance. Restart Indexing service if Elasticsearch is not running

Enterprise Vault erroneously evaluates available free space on the disk(s) hosting Elasticsearch indexes.
This issue has been addressed in the following release(s):
https://downloads.enterprisevault.com/enterprise-vault/REL150734?page=4
https://downloads.enterprisevault.com/enterprise-vault/REL478760
In rare circumstances, misleading warnings about Elasticsearch JVM heap usage could be logged into the Enterprise Vault admin console.
JIRA: CFT-5296