public GetReadSetMetadataResult withEtag(ETag etag) {
        setEtag(etag);
        return this;
    }
<p>
The entity tag (ETag) is a hash of the object meant to represent its semantic content.
</p>

@param etag
       The entity tag (ETag) is a hash of the object meant to represent its semantic content.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-omics/src/main/java/com/amazonaws/services/omics/model/GetReadSetMetadataResult.java