Message: Unable to display zone item

Caused by: java.lang.RuntimeException: field "last-validation" does not appear to be indexed
	at org.apache.lucene.search.ExtendedFieldCacheImpl$5.createValue(ExtendedFieldCacheImpl.java:173)
	at org.apache.lucene.search.FieldCacheImpl$Cache.get(FieldCacheImpl.java:71)
	at org.apache.lucene.search.ExtendedFieldCacheImpl.getAuto(ExtendedFieldCacheImpl.java:127)
	at org.apache.lucene.search.FieldSortedHitQueue.comparatorAuto(FieldSortedHitQueue.java:487)
	at org.apache.lucene.search.FieldSortedHitQueue$1.createValue(FieldSortedHitQueue.java:184)
	at org.apache.lucene.search.FieldCacheImpl$Cache.get(FieldCacheImpl.java:71)
	at org.apache.lucene.search.FieldSortedHitQueue.getCachedComparator(FieldSortedHitQueue.java:167)
	at org.apache.lucene.search.FieldSortedHitQueue.<init>(FieldSortedHitQueue.java:55)
	at org.apache.lucene.search.TopFieldDocCollector.<init>(TopFieldDocCollector.java:43)
	at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:121)
	at org.apache.lucene.search.Searcher.search(Searcher.java:86)
	at org.ametys.web.frontoffice.AbstractSearchGenerator.search(AbstractSearchGenerator.java:222)
	at org.ametys.web.frontoffice.SearchGenerator.search(SearchGenerator.java:138)
	at org.ametys.web.frontoffice.AbstractSearchGenerator.generate(AbstractSearchGenerator.java:184)