Use of the low-level REST client on JDK 7 is deprecated and will be removed in version 7.0.0 of the client – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-6.8

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Briefly, this error occurs when you’re using the low-level REST client on JDK 7 with Elasticsearch. The low-level REST client is deprecated and will be removed in version 7.0.0 of the client. To resolve this issue, you can upgrade your JDK to a newer version, preferably JDK 8 or higher. Alternatively, you can switch to using the high-level REST client, which is the recommended client for Elasticsearch.

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This guide will help you check for common problems that cause the log ” use of the low-level REST client on JDK 7 is deprecated and will be removed in version 7.0.0 of the client ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: client, version, rest.

Log Context

Log “use of the low-level REST client on JDK 7 is deprecated and will be removed in version 7.0.0 of the client” classname is RestClient.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        this.pathPrefix = pathPrefix;
        this.nodeSelector = nodeSelector;
        this.warningsHandler = strictDeprecationMode ? WarningsHandler.STRICT : WarningsHandler.PERMISSIVE;
        setNodes(nodes);
        if (JavaVersion.current().compareTo(JavaVersion.parse("1.8.0")) 

 

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