elastic/elasticsearch · error · IllegalArgumentException

Coefficient not computed between fields: {fieldX} and {field

Error message

Coefficient not computed between fields: {fieldX} and {fieldY}

What it means

Error "Coefficient not computed between fields: {fieldX} and {fieldY}" thrown in elastic/elasticsearch.

Source

Thrown at modules/aggregations/src/main/java/org/elasticsearch/aggregations/metric/MatrixStatsResults.java:185

    /** return the value for two fields in an upper triangular matrix, regardless of row col location. */
    static <M extends Map<String, Double>> double getValFromUpperTriangularMatrix(Map<String, M> map, String fieldX, String fieldY) {
        // for the co-value to exist, one of the two (or both) fields has to be a row key
        if (map.containsKey(fieldX) == false && map.containsKey(fieldY) == false) {
            throw new IllegalArgumentException("neither field " + fieldX + " nor " + fieldY + " exist");
        } else if (map.containsKey(fieldX)) {
            // fieldX exists as a row key
            if (map.get(fieldX).containsKey(fieldY)) {
                // fieldY exists as a col key to fieldX
                return map.get(fieldX).get(fieldY);
            } else {
                // otherwise fieldX is the col key to fieldY
                return map.get(fieldY).get(fieldX);
            }
        } else if (map.containsKey(fieldY)) {
            // fieldX did not exist as a row key, it must be a col key
            return map.get(fieldY).get(fieldX);
        }
        throw new IllegalArgumentException("Coefficient not computed between fields: " + fieldX + " and " + fieldY);
    }

    private static void checkField(String field, Map<String, ?> map) {
        if (field == null) {
            throw new IllegalArgumentException("field name cannot be null");
        }
        if (map.containsKey(field) == false) {
            throw new IllegalArgumentException("field " + field + " does not exist");
        }
    }

    /** Computes final covariance, variance, and correlation */
    private void compute() {
        final double nM1 = results.docCount - 1D;
        // compute final skewness and kurtosis
        for (String fieldName : results.means.keySet()) {
            final double var = results.variances.get(fieldName);
            // update skewness

View on GitHub (pinned to db6a809a66)

When it happens

Trigger: Thrown at modules/aggregations/src/main/java/org/elasticsearch/aggregations/metric/MatrixStatsResults.java:185 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of elastic/elasticsearch@db6a809a66 (2026-08-12). Data as JSON: /api/errors/43d0b128b92311bd. Report an issue: GitHub.