public void setETag(String eTag) {
        this.eTag = eTag;
    }
<p>
The opaque identifier assigned by a web server to a specific version of a resource found at a URL.
</p>

@param eTag
       The opaque identifier assigned by a web server to a specific version of a resource found at a URL.
aws-java-sdk-securityhub/src/main/java/com/amazonaws/services/securityhub/model/AwsS3ObjectDetails.java