src/main/java/org/opensearch/performanceanalyzer/collectors/NodeStatsAllShardsMetricsCollector.java [151:170]:
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    @Override
    public String getMetricsPath(long startTime, String... keysPath) {
        // throw exception if keysPath.length is not equal to 2 (Keys should be Index Name, and
        // ShardId)
        if (keysPath.length != KEYS_PATH_LENGTH) {
            throw new RuntimeException("keys length should be " + KEYS_PATH_LENGTH);
        }
        return PerformanceAnalyzerMetrics.generatePath(
                startTime, PerformanceAnalyzerMetrics.sIndicesPath, keysPath[0], keysPath[1]);
    }

    @Override
    public void collectMetrics(long startTime) {
        IndicesService indicesService = OpenSearchResources.INSTANCE.getIndicesService();

        if (indicesService == null) {
            return;
        }

        try {
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src/main/java/org/opensearch/performanceanalyzer/collectors/NodeStatsFixedShardsMetricsCollector.java [206:226]:
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    @Override
    public String getMetricsPath(long startTime, String... keysPath) {
        // throw exception if keysPath.length is not equal to 2 (Keys should be Index Name, and
        // ShardId)
        if (keysPath.length != KEYS_PATH_LENGTH) {
            throw new RuntimeException("keys length should be " + KEYS_PATH_LENGTH);
        }

        return PerformanceAnalyzerMetrics.generatePath(
                startTime, PerformanceAnalyzerMetrics.sIndicesPath, keysPath[0], keysPath[1]);
    }

    @Override
    public void collectMetrics(long startTime) {
        IndicesService indicesService = OpenSearchResources.INSTANCE.getIndicesService();

        if (indicesService == null) {
            return;
        }

        try {
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