Remove grace period from license expiration check (#67316)

License expiration checking currently has a 7 day grace period. When a
license expires, the licensing code acts as if it is not yet expired.
This was originally intended to protect users who may accidentally end up
letting their license expire from the pain of their licensed features
ceasing to work. However, the grace period effectively shifts the
license expiration by a week, resulting in confusion since the actual
license expiration date is not accurate. It also is less of a concern
now as not only do we emit several warnings for upcoming license
expiration, but the new license can be downloaded and installed quickly
by the user through the support portal.

This commit removes the license grace period altogether.

x-pack/plugin/core/src/main/java/org/elasticsearch/license/LicenseService.java

@@ -78,11 +78,6 @@ public class LicenseService extends AbstractLifecycleComponent implements Cluste
     static final Set<License.LicenseType> VALID_TRIAL_TYPES = Collections.unmodifiableSet(Sets.newHashSet(
         License.LicenseType.GOLD, License.LicenseType.PLATINUM, License.LicenseType.ENTERPRISE, License.LicenseType.TRIAL));
 
-    /**
-     * Duration of grace period after a license has expired
-     */
-    static final TimeValue GRACE_PERIOD_DURATION = days(7);
-
     /**
      * Period before the license expires when warning starts being added to the response header
      */
@@ -193,16 +188,9 @@ public void on(License license) {
                 logExpirationWarning(license.expiryDate(), false);
             }
         });
-        expirationCallbacks.add(new ExpirationCallback.Pre(days(0), days(7), TimeValue.timeValueMinutes(10)) {
-            @Override
-            public void on(License license) {
-                logExpirationWarning(license.expiryDate(), false);
-            }
-        });
         expirationCallbacks.add(new ExpirationCallback.Post(days(0), null, TimeValue.timeValueMinutes(10)) {
             @Override
             public void on(License license) {
-                // logged when grace period begins
                 logExpirationWarning(license.expiryDate(), true);
             }
         });
@@ -487,22 +475,16 @@ protected void updateLicenseState(final License license, Version mostRecentTrial
         }
         if (license != null) {
             long time = clock.millis();
-            boolean active;
+            final boolean active;
             if (license.expiryDate() == BASIC_SELF_GENERATED_LICENSE_EXPIRATION_MILLIS) {
                 active = true;
             } else {
-                // We subtract the grace period from the current time to avoid overflowing on an expiration
-                // date that is near Long.MAX_VALUE
-                active = time >= license.issueDate() && time - GRACE_PERIOD_DURATION.getMillis() < license.expiryDate();
+                active = time >= license.issueDate() && time < license.expiryDate();
             }
             licenseState.update(license.operationMode(), active, license.expiryDate(), mostRecentTrialVersion);
 
             if (active) {
-                if (time < license.expiryDate()) {
-                    logger.debug("license [{}] - valid", license.uid());
-                } else {
-                    logger.warn("license [{}] - grace", license.uid());
-                }
+                logger.debug("license [{}] - valid", license.uid());
             } else {
                 logger.warn("license [{}] - expired", license.uid());
             }
@@ -553,8 +535,6 @@ static SchedulerEngine.Schedule nextLicenseCheck(License license) {
                 return license.issueDate();
             } else if (time < license.expiryDate()) {
                 return license.expiryDate();
-            } else if (time < license.expiryDate() + GRACE_PERIOD_DURATION.getMillis()) {
-                return license.expiryDate() + GRACE_PERIOD_DURATION.getMillis();
             }
             return -1; // license is expired, no need to check again
         };

x-pack/plugin/core/src/test/java/org/elasticsearch/license/LicenseScheduleTests.java

@@ -30,16 +30,8 @@ public void testEnabledLicenseSchedule() throws Exception {
         assertThat(schedule.nextScheduledTimeAfter(license.issueDate(), triggeredTime), equalTo(license.expiryDate()));
     }
 
-    public void testGraceLicenseSchedule() throws Exception {
-        long triggeredTime = license.expiryDate() + between(1,
-                ((int) LicenseService.GRACE_PERIOD_DURATION.getMillis()));
-        assertThat(schedule.nextScheduledTimeAfter(license.issueDate(), triggeredTime),
-                equalTo(license.expiryDate() + LicenseService.GRACE_PERIOD_DURATION.getMillis()));
-    }
-
     public void testExpiredLicenseSchedule() throws Exception {
-        long triggeredTime = license.expiryDate() + LicenseService.GRACE_PERIOD_DURATION.getMillis() +
-                randomIntBetween(1, 1000);
+        long triggeredTime = license.expiryDate() + randomIntBetween(1, 1000);
         assertThat(schedule.nextScheduledTimeAfter(license.issueDate(), triggeredTime),
                 equalTo(-1L));
     }

x-pack/plugin/core/src/test/java/org/elasticsearch/license/LicenseServiceClusterTests.java

@@ -126,26 +126,12 @@ public void testClusterRestartWhileEnabled() throws Exception {
         assertLicenseActive(true);
     }
 
-    public void testClusterRestartWhileGrace() throws Exception {
-        wipeAllLicenses();
-        internalCluster().startNode();
-        assertLicenseActive(true);
-        putLicense(TestUtils.generateSignedLicense(TimeValue.timeValueMillis(0)));
-        ensureGreen();
-        assertLicenseActive(true);
-        logger.info("--> restart node");
-        internalCluster().fullRestart();
-        ensureYellow();
-        logger.info("--> await node for grace_period");
-        assertLicenseActive(true);
-    }
-
     public void testClusterRestartWhileExpired() throws Exception {
         wipeAllLicenses();
         internalCluster().startNode();
         ensureGreen();
         assertLicenseActive(true);
-        putLicense(TestUtils.generateExpiredNonBasicLicense(System.currentTimeMillis() - LicenseService.GRACE_PERIOD_DURATION.getMillis()));
+        putLicense(TestUtils.generateExpiredNonBasicLicense(System.currentTimeMillis()));
         assertLicenseActive(false);
         logger.info("--> restart node");
         internalCluster().fullRestart();