No indexing: many "PRE_UPDATE add" in Solr4

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Member II

No indexing: many "PRE_UPDATE add" in Solr4

Hi
My Solr4 was stopped indexing new content many hour ago. In the log file I'm seeing many "PRE_UPDATE add". What is it doing?
LogUpdateProcessor]| PRE_UPDATE add{,id=_DEFAULT_!800000000002cfa5!80000000003351fd} LocalSolrQueryRequest{defType=afts&df=suggest&echoParams=explicit&rows=2147483647&q=ANCESTOR%3A%22workspace%3A%2F%2FSpacesStore%2F96d33f61-a737-410e-8031-5ea4241a2403%22+AND+-CASCADETX%3A%5B88064+TO+MAX%5D+AND+TENANT%3A%22_DEFAULT_%22&fl=id&alfresco.getSolrDocumentList=true}
LogUpdateProcessor]| PRE_UPDATE add{,id=_DEFAULT_!800000000002b1e0!8000000000ed70a9} LocalSolrQueryRequest{defType=afts&df=suggest&echoParams=explicit&rows=2147483647&q=ANCESTOR%3A%22workspace%3A%2F%2FSpacesStore%2Fbdf8227d-5d5e-4ad9-9d10-597655f400bc%22+AND+-CASCADETX%3A%5B889+TO+MAX%5D+AND+TENANT%3A%22_DEFAULT_%22&fl=id&alfresco.getSolrDocumentList=true}
LogUpdateProcessor]| PRE_UPDATE add{,id=_DEFAULT_!800000000002cfa5!800000000053519d} LocalSolrQueryRequest{defType=afts&df=suggest&echoParams=explicit&rows=2147483647&q=ANCESTOR%3A%22workspace%3A%2F%2FSpacesStore%2F96d33f61-a737-410e-8031-5ea4241a2403%22+AND+-CASCADETX%3A%5B88064+TO+MAX%5D+AND+TENANT%3A%22_DEFAULT_%22&fl=id&alfresco.getSolrDocumentList=true}
LogUpdateProcessor]| PRE_UPDATE add{,id=_DEFAULT_!800000000002cfa5!80000000006d7028} LocalSolrQueryRequest{defType=afts&df=suggest&echoParams=explicit&rows=2147483647&q=ANCESTOR%3A%22workspace%3A%2F%2FSpacesStore%2Fbdf8227d-5d5e-4ad9-9d10-597655f400bc%22+AND+-CASCADETX%3A%5B889+TO+MAX%5D+AND+TENANT%3A%22_DEFAULT_%22&fl=id&alfresco.getSolrDocumentList=true}