Expected to see nr periods filed but found nothing – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1.3-2.9

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Briefly, this error occurs when the OpenSearch engine expects to find a field named ‘nr_periods’ in the data but it’s missing. This could be due to incorrect data input, a missing field in the data source, or a misconfiguration in the OpenSearch settings. To resolve this, ensure that the ‘nr_periods’ field is present in your data source and correctly mapped in your OpenSearch index. Also, check your OpenSearch configuration to ensure it’s correctly set to handle this field. If the field is not necessary, you may need to adjust your queries or configurations to exclude it.

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This guide will help you check for common problems that cause the log ” Expected to see nr_periods filed but found nothing ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: monitor.

Log Context

Log “Expected to see nr_periods filed but found nothing” classname is OsProbe.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        if (isCpuStatWarningsLogged.getAndSet(true) == false) {
            if (numberOfPeriods == -1) {
                logger.warn("Expected to see nr_periods filed but found nothing");
            if (numberOfTimesThrottled == -1) {
                logger.warn("Expected to see nr_throttled filed but found nothing");
            if (timeThrottledNanos == -1) {


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