NPE on ACP in JsonESDocumentWriter on version without live

14:46:15,830 ERROR [WorkManagerImpl] Uncaught error on thread Nuxeo-Work-elasticSearchIndexing-1
org.nuxeo.ecm.core.api.ClientException: Unable to create index request for Document ab7c3f5f-1e21-4d83-8e76-dd9fd48d3288
	at org.nuxeo.elasticsearch.core.ElasticSearchIndexingImpl.buildEsIndexingRequest(ElasticSearchIndexingImpl.java:291)
	at org.nuxeo.elasticsearch.core.ElasticSearchIndexingImpl.processIndexCommand(ElasticSearchIndexingImpl.java:193)
	at org.nuxeo.elasticsearch.core.ElasticSearchIndexingImpl.indexNow(ElasticSearchIndexingImpl.java:180)
	at org.nuxeo.elasticsearch.ElasticSearchComponent.indexNow(ElasticSearchComponent.java:329)
	at org.nuxeo.elasticsearch.work.IndexingWorker.doIndexingWork(IndexingWorker.java:66)
	at org.nuxeo.elasticsearch.work.AbstractIndexingWorker.work(AbstractIndexingWorker.java:67)
	at org.nuxeo.ecm.core.work.AbstractWork.runWorkWithTransaction(AbstractWork.java:351)
	at org.nuxeo.ecm.core.work.AbstractWork.runWorkWithTransactionAndCheckExceptions(AbstractWork.java:312)
	at org.nuxeo.ecm.core.work.AbstractWork.run(AbstractWork.java:280)
	at org.nuxeo.ecm.core.work.WorkHolder.run(WorkHolder.java:52)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
	at org.nuxeo.ecm.automation.jaxrs.io.documents.JsonESDocumentWriter.writeDoc(JsonESDocumentWriter.java:101)
	at org.nuxeo.ecm.automation.jaxrs.io.documents.JsonESDocumentWriter.writeESDocument(JsonESDocumentWriter.java:153)
	at org.nuxeo.elasticsearch.core.ElasticSearchIndexingImpl.buildEsIndexingRequest(ElasticSearchIndexingImpl.java:284)
	... 12 more