src/main/java/org/opensearch/performanceanalyzer/collectors/NodeStatsAllShardsMetricsCollector.java [198:213]:
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        } catch (Exception ex) {
            LOG.debug(
                    "Exception in Collecting NodesStats Metrics: {} for startTime {} with ExceptionCode: {}",
                    () -> ex.toString(),
                    () -> startTime,
                    () -> StatExceptionCode.NODESTATS_COLLECTION_ERROR.toString());
            PerformanceAnalyzerApp.ERRORS_AND_EXCEPTIONS_AGGREGATOR.updateStat(
                    ExceptionsAndErrors.NODESTATS_COLLECTION_ERROR, "", 1);
        }
    }

    // - Separated to have a unit test; and catch any code changes around this field
    Field getNodeIndicesStatsByShardField() throws Exception {
        Field field = NodeIndicesStats.class.getDeclaredField("statsByShard");
        field.setAccessible(true);
        return field;
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src/main/java/org/opensearch/performanceanalyzer/collectors/NodeStatsFixedShardsMetricsCollector.java [265:280]:
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        } catch (Exception ex) {
            LOG.debug(
                    "Exception in Collecting NodesStats Metrics: {} for startTime {} with ExceptionCode: {}",
                    () -> ex.toString(),
                    () -> startTime,
                    () -> StatExceptionCode.NODESTATS_COLLECTION_ERROR.toString());
            PerformanceAnalyzerApp.ERRORS_AND_EXCEPTIONS_AGGREGATOR.updateStat(
                    ExceptionsAndErrors.NODESTATS_COLLECTION_ERROR, "", 1);
        }
    }

    // - Separated to have a unit test; and catch any code changes around this field
    Field getNodeIndicesStatsByShardField() throws Exception {
        Field field = NodeIndicesStats.class.getDeclaredField("statsByShard");
        field.setAccessible(true);
        return field;
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