Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many configuration errors.
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Take a self-guided product tour to see for yourself (no registration required).This guide will help you check for common problems that cause the log ” malformed signature for license ” + builder.uid + ” ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: license, plugin.
Log Context
Log “malformed signature for license [” + builder.uid + “]”classname is License.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :
try {
byte[] signatureBytes = Base64.getDecoder().decode(builder.signature);
ByteBuffer byteBuffer = ByteBuffer.wrap(signatureBytes);
version = byteBuffer.getInt();
} catch (Exception e) {
throw new ElasticsearchParseException("malformed signature for license [" + builder.uid + "]"; e);
}
// we take the absolute version; because negative versions
// mean that the license was generated by the cluster (see TrialLicense)
// and positive version means that the license was signed
if (version < 0) {
