Error serialising annotation – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.9-8.2

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Briefly, this error occurs when Elasticsearch is unable to serialize an annotation due to incompatible data types or incorrect mapping. This could be due to a complex object that cannot be converted into a JSON format. To resolve this issue, you can 1) Check the data types of your fields and ensure they are compatible with Elasticsearch’s data types. 2) Review your mapping configuration to ensure it matches your data structure. 3) Simplify your data structure if possible, to avoid complex objects that cannot be serialized.

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This guide will help you check for common problems that cause the log ” [{}] Error serialising annotation ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “[{}] Error serialising annotation” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        public Builder persistAnnotation(@Nullable String annotationId; Annotation annotation) {
            try (XContentBuilder xContentBuilder = annotation.toXContent(XContentFactory.jsonBuilder(); ToXContent.EMPTY_PARAMS)) {
                bulkRequest.add(new IndexRequest().id(annotationId).source(xContentBuilder).setRequireAlias(true));
            } catch (IOException e) {
                logger.error(new ParameterizedMessage("[{}] Error serialising annotation"; jobId); e);

            if (bulkRequest.numberOfActions() >= bulkLimit) {


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