elastic/elasticsearch · error · IllegalArgumentException

[gap_policy] must not be null.

Error message

[gap_policy] must not be null.

What it means

Error "[gap_policy] must not be null." thrown in elastic/elasticsearch.

Source

Thrown at modules/aggregations/src/main/java/org/elasticsearch/aggregations/pipeline/MovFnPipelineAggregationBuilder.java:134

     * Gets the format to use on the output of this aggregation.
     */
    public String format() {
        return format;
    }

    protected DocValueFormat formatter() {
        if (format != null) {
            return new DocValueFormat.Decimal(format);
        }
        return DocValueFormat.RAW;
    }

    /**
     * Sets the gap policy to use for this aggregation.
     */
    public MovFnPipelineAggregationBuilder gapPolicy(GapPolicy gapPolicy) {
        if (gapPolicy == null) {
            throw new IllegalArgumentException("[" + GAP_POLICY.getPreferredName() + "] must not be null.");
        }
        this.gapPolicy = gapPolicy;
        return this;
    }

    /**
     * Gets the gap policy to use for this aggregation.
     */
    public GapPolicy gapPolicy() {
        return gapPolicy;
    }

    /**
     * Returns the window size for this aggregation
     */
    public int getWindow() {
        return window;
    }

View on GitHub (pinned to db6a809a66)

When it happens

Trigger: Thrown at modules/aggregations/src/main/java/org/elasticsearch/aggregations/pipeline/MovFnPipelineAggregationBuilder.java:134 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/1c94840c23da3a60. Report an issue: GitHub.