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問題
ポータルの完全な再インデックスを実行しようとすると、ログに以下のエラーが表示されます：
java.lang.IllegalStateException: Unknown background task executor com.liferay.portal.search.internal.background.task.ReindexPortalBackgroundTaskExecutor at com.liferay.portal.background.task.internal.messaging.BackgroundTaskMessageListener._getBackgroundTaskExecutor(BackgroundTaskMessageListener.java:249) at com.liferay.portal.background.task.internal.messaging.BackgroundTaskMessageListener._wrapBackgroundTaskExecutor(BackgroundTaskMessageListener.java:300) at com.liferay.portal.background.task.internal.messaging.BackgroundTaskMessageListener.doReceive(BackgroundTaskMessageListener.java:111) at com.liferay.portal.kernel.messaging.BaseMessageListener.doReceive(BaseMessageListener.java:48) at com.liferay.portal.kernel.messaging.BaseMessageListener.receive(BaseMessageListener.java:34) at com.liferay.portal.kernel.messaging.InvokerMessageListener.receive(InvokerMessageListener.java:74) at com.liferay.portal.messaging.internal.ParallelDestination$1.run(ParallelDestination.java:56) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at java.base/java.lang.Thread.run(Thread.java:829)