Use more idomatic code

Author: Kerry350

x-pack/legacy/plugins/infra/public/pages/logs/analysis/sections/anomalies/index.tsx

@@ -190,9 +190,7 @@ const AnnotationTooltip: React.FunctionComponent<{ details: string }> = ({ detai
         {parsedDetails.anomalyScoresByPartition.map(
           ({ partitionId, maximumAnomalyScore }, index) => {
             return (
-              <li
-                key={`${index}-overall-anomaly-chart-${partitionId}-partition-score-${maximumAnomalyScore}`}
-              >
+              <li key={`overall-anomaly-chart-${partitionId}`}>
                 <span>
                   {`${partitionId}: `}
                   <b>{maximumAnomalyScore}</b>

x-pack/legacy/plugins/infra/public/pages/logs/analysis/sections/anomalies/table.tsx

@@ -100,11 +100,8 @@ export const AnomaliesTable: React.FunctionComponent<{
   const toggleExpandedItems = useCallback(
     item => {
       if (itemIdToExpandedRowMap[item.id]) {
-        const newItemIdToExpandedRowMap = {
-          ...itemIdToExpandedRowMap,
-        };
-        delete newItemIdToExpandedRowMap[item.id];
-        setItemIdToExpandedRowMap(newItemIdToExpandedRowMap);
+        const { [item.id]: toggledItem, ...remainingExpandedRowMap } = itemIdToExpandedRowMap;
+        setItemIdToExpandedRowMap(remainingExpandedRowMap);
       } else {
         const newItemIdToExpandedRowMap = {
           ...itemIdToExpandedRowMap,