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

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.

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 :

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this.pathPrefix = pathPrefix;
this.nodeSelector = nodeSelector;
this.warningsHandler = strictDeprecationMode ? WarningsHandler.STRICT : WarningsHandler.PERMISSIVE;
setNodes(nodes);
if (JavaVersion.current().compareTo(JavaVersion.parse("1.8.0"))
<p> </p>
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this.pathPrefix = pathPrefix; this.nodeSelector = nodeSelector; this.warningsHandler = strictDeprecationMode ? WarningsHandler.STRICT : WarningsHandler.PERMISSIVE; setNodes(nodes); if (JavaVersion.current().compareTo(JavaVersion.parse("1.8.0")) <p> </p> <p></p><div class="rmp-widgets-container rmp-wp-plugin rmp-main-container js-rmp-widgets-container js-rmp-widgets-container--1057 " data-post-id="1057"> <div class="rmp-rating-widget js-rmp-rating-widget"> <p class="rmp-heading rmp-heading--title"> How helpful was this guide? </p> <div class="rmp-rating-widget__icons"> <ul class="rmp-rating-widget__icons-list js-rmp-rating-icons-list"> <li class="rmp-rating-widget__icons-list__icon js-rmp-rating-item" data-descriptive-rating="Not at all useful" data-value="1"> <i class="js-rmp-rating-icon rmp-icon rmp-icon--ratings rmp-icon--star "></i> </li> <li class="rmp-rating-widget__icons-list__icon js-rmp-rating-item" data-descriptive-rating="Somewhat useful" data-value="2"> <i class="js-rmp-rating-icon rmp-icon rmp-icon--ratings rmp-icon--star "></i> </li> <li class="rmp-rating-widget__icons-list__icon js-rmp-rating-item" data-descriptive-rating="Useful" data-value="3"> <i class="js-rmp-rating-icon rmp-icon rmp-icon--ratings rmp-icon--star "></i> </li> <li class="rmp-rating-widget__icons-list__icon js-rmp-rating-item" data-descriptive-rating="Fairly useful" data-value="4"> <i class="js-rmp-rating-icon rmp-icon rmp-icon--ratings rmp-icon--star "></i> </li> <li class="rmp-rating-widget__icons-list__icon js-rmp-rating-item" data-descriptive-rating="Very useful" data-value="5"> <i class="js-rmp-rating-icon rmp-icon rmp-icon--ratings rmp-icon--star "></i> </li> </ul> </div> <p class="rmp-rating-widget__hover-text js-rmp-hover-text"></p> <button class="rmp-rating-widget__submit-btn rmp-btn js-submit-rating-btn"> Submit Rating </button> <p class="rmp-rating-widget__results js-rmp-results "> </p> <p class="rmp-rating-widget__not-rated js-rmp-not-rated rmp-rating-widget__not-rated--hidden"> </p> <p class="rmp-rating-widget__msg js-rmp-msg"></p> </div> <div class="rmp-feedback-widget js-rmp-feedback-widget"> <p class="rmp-heading rmp-heading--title"> We are sorry that this post was not useful for you! </p> <p class="rmp-heading rmp-heading--subtitle"> Let us improve this post! </p> <div class="rmp-feedback-widget__container"> <p class="rmp-feedback-widget__text"> Tell us how we can improve this post? </p> <textarea class="rmp-feedback-widget__input js-rmp-feedback-input" rows="5" id="feedback-text"></textarea> <button type="button" class="rmp-feedback-widget__btn rmp-btn rmp-btn--large js-rmp-feedback-button"> Submit Feedback </button> <div class="rmp-feedback-widget__loader js-rmp-feedback-loader"> <div></div><div></div><div></div> </div> <p class="rmp-feedback-widget__msg js-rmp-feedback-msg"></p> </div> </div> </div>
        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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