Fix issue with long values in TSVB static metric (#40256)

* Fix issue with long values in TSVB static metric

* Handle numeric values with decimal zeros

* Work properly with exponential values

* Wrap into boolean

src/legacy/core_plugins/metrics/server/lib/vis_data/helpers/bucket_transform.js

@@ -78,11 +78,13 @@ export const bucketTransform = {
   },
   static: bucket => {
     checkMetric(bucket, ['value']);
+    // Anything containing a decimal point or an exponent is considered decimal value
+    const isDecimalValue = Boolean(bucket.value.match(/[.e]/i));
     return {
       bucket_script: {
         buckets_path: { count: '_count' },
         script: {
-          source: bucket.value,
+          source: isDecimalValue ? bucket.value : `${bucket.value}L`,
           lang: 'painless',
         },
         gap_policy: 'skip',

src/legacy/core_plugins/metrics/server/lib/vis_data/helpers/bucket_transform.test.js

@@ -63,5 +63,35 @@ describe('src/legacy/core_plugins/metrics/server/lib/vis_data/helpers/bucket_tra
         expect(bucketTransform.moving_average(bucket, metrics)).toMatchSnapshot();
       });
     });
+
+    describe('static', () => {
+      test('should return a script with a double value when using decimals', () => {
+        expect(bucketTransform.static({ value: '421.12' })).toHaveProperty(
+          'bucket_script.script.source',
+          '421.12'
+        );
+      });
+
+      test('should return a long script for integer values', () => {
+        expect(bucketTransform.static({ value: '1234567890123' })).toHaveProperty(
+          'bucket_script.script.source',
+          '1234567890123L'
+        );
+      });
+
+      test('should not return a long script for exponential values', () => {
+        expect(bucketTransform.static({ value: '123123123e12' })).toHaveProperty(
+          'bucket_script.script.source',
+          '123123123e12'
+        );
+      });
+
+      test('should return decimal scripts for very large decimals', () => {
+        expect(bucketTransform.static({ value: '1234178312312381273123123.11123' })).toHaveProperty(
+          'bucket_script.script.source',
+          '1234178312312381273123123.11123'
+        );
+      });
+    });
   });
 });