Fix ES manage alias feature in HF55 with MongoDB

When setting up a 10.10-HF55 Nuxeo instance with the manage alias feature enabled and MongoDB, The startup fails when accessing the key value store.

How to reproduce:

• fire up a 10.10 Nuxeo instance with:
  • HF55
  • MongoDB
  • the ES manage alias feature enbaled:

    elasticsearch.manageAlias.enabled=true
    

• drop the 2 nuxeo ES indexes (to have the aliases defined on the proper index):

  curl -XDELETE http://localhost:9200/nuxeo-0000
  curl -XDELETE http://localhost:9200/nuxeo
  

• restart the Nuxeo instance
• after restart, list the elasticsearch indexes:

  curl http://localhost:9200/_aliases?pretty
  {
    "nuxeo-0000" : {
      "aliases" : {
        "nuxeo" : { },
        "nuxeo-write" : { }
      }
    },
    "nuxeo-audit" : {
      "aliases" : { }
    },
    "nuxeo-uidgen" : {
      "aliases" : { }
    }
  }
  

• launch a full re-index with this command:

  curl -X POST -su Administrator:Administrator -H 'Content-Type:application/json' -d '{}' http://localhost:8080/nuxeo/api/v1/automation/Elasticsearch.BulkIndex
  

• after the re-index, list the elasticsearch indexes:

  curl http://localhost:9200/_aliases?pretty
    "nuxeo-0000" : {
      "aliases" : { }
    },
    "nuxeo-0001" : {
      "aliases" : {
        "nuxeo" : { },
        "nuxeo-write" : { }
      }
    },
    "nuxeo-audit" : {
      "aliases" : { }
    },
    "nuxeo-uidgen" : {
      "aliases" : { }
    }
  }
  

• restart the Nuxeo instance

Expected result: the Nuxeo instance started successfully
Actual result: the Nuxeo startup failed. See the errors in the attached server.log.