Put weighted routing weights in metadata – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.4-2.4

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Briefly, this error occurs when there’s an attempt to assign weighted routing weights in the metadata of an OpenSearch index, but the weights are not properly defined or formatted. To resolve this issue, ensure that the weights are correctly defined and formatted according to OpenSearch’s requirements. Also, check if the index supports weighted routing. If it doesn’t, consider upgrading to a version that does or reconfigure your index to support it. Lastly, ensure that the weights are being assigned to the correct index.

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This guide will help you check for common problems that cause the log ” put weighted routing weights in metadata [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: metadata, cluster, routing.

Log Context

Log “put weighted routing weights in metadata [{}]” classname is WeightedRoutingService.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                Metadata metadata = currentState.metadata();
                Metadata.Builder mdBuilder = Metadata.builder(currentState.metadata());
                WeightedRoutingMetadata weightedRoutingMetadata = metadata.custom(WeightedRoutingMetadata.TYPE);
                if (weightedRoutingMetadata == null) {
                    logger.info("put weighted routing weights in metadata [{}]"; request.getWeightedRouting());
                    weightedRoutingMetadata = new WeightedRoutingMetadata(request.getWeightedRouting());
                } else {
                    if (!checkIfSameWeightsInMetadata(newWeightedRoutingMetadata; weightedRoutingMetadata)) {
                        logger.info("updated weighted routing weights [{}] in metadata"; request.getWeightedRouting());
                        weightedRoutingMetadata = new WeightedRoutingMetadata(newWeightedRoutingMetadata.getWeightedRouting());


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