Fix AWS module flaky tests (#24852) (#25023)

(cherry picked from commit 6e6666c)

metricbeat/docs/fields.asciidoc

@@ -3263,6 +3263,18 @@ type: long
 
 
 
+*`aws.rds.burst_balance.pct`*::
++
+--
+The percent of General Purpose SSD (gp2) burst-bucket I/O credits available.
+
+
+type: scaled_float
+
+format: percent
+
+--
+
 *`aws.rds.cpu.total.pct`*::
 +
 --

metricbeat/mb/testing/testdata.go

@@ -180,7 +180,7 @@ func TestMetricsetFieldsDocumented(t *testing.T, metricSet mb.MetricSet, events
 	}
 
 	if err := checkDocumented(data, nil); err != nil {
-		t.Errorf("%v: check if fields are documented in `metricbeat/%s/%s/_meta/fields.yml` "+
+		t.Errorf("%v: check if fields are documented in `metricbeat/module/%s/%s/_meta/fields.yml` "+
 			"file or run 'make update' on Metricbeat folder to update fields in `metricbeat/fields.yml`",
 			err, metricSet.Module().Name(), metricSet.Name())
 	}
@@ -232,7 +232,7 @@ func runTest(t *testing.T, file string, module, metricSetName string, config Dat
 	})
 
 	if err := checkDocumented(data, config.OmitDocumentedFieldsCheck); err != nil {
-		t.Errorf("%v: check if fields are documented in `metricbeat/%s/%s/_meta/fields.yml` "+
+		t.Errorf("%v: check if fields are documented in `metricbeat/module/%s/%s/_meta/fields.yml` "+
 			"file or run 'make update' on Metricbeat folder to update fields in `metricbeat/fields.yml`",
 			err, module, metricSetName)
 	}
@@ -378,6 +378,13 @@ func documentedFieldCheck(foundKeys common.MapStr, knownKeys map[string]interfac
 				}
 			}
 
+			// case `aws.*.metrics.*.*`:
+			if len(splits) == 5 {
+				if _, ok := knownKeys[splits[0]+".*."+splits[2]+".*.*"]; ok {
+					continue
+				}
+			}
+
 			return errors.Errorf("field missing '%s'", foundKey)
 		}
 	}