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Briefly, this error occurs when an Elasticsearch policy is not defined or is missing in a request. This could be due to a misconfiguration or an oversight while setting up the Elasticsearch cluster. To resolve this issue, you can either define the missing policy or ensure that the policy is correctly referenced in your request. Additionally, check your Elasticsearch configuration files to ensure that all necessary policies are correctly defined and referenced.
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This guide will help you check for common problems that cause the log ” policy must not be null ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.
Log Context
Log “policy must not be null” class name is LifecyclePolicyUtils.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
/**
* Parses and validates that the source is not empty.
*/
private static void validate(BytesReference source) {
if (source == null) {
throw new ElasticsearchParseException("policy must not be null");
} try {
XContentHelper.convertToMap(source; false; XContentType.JSON).v2();
} catch (NotXContentException e) {
