Fix DocumentModel#isVersion value when document is fetched from Elasticsearch

Pre-requisite : nxql_search page provider must use Elasticsearch

Steps to reproduce:

1. add elasticsearch.fetchDocFromEs=true to nuxeo.conf
2. start Nuxeo
3. create a document and do a major version
4. go to NXQL search and run NXQL query "select * from Document Where isVersion = 1"
5. open the Developer tools and watch the value "isVersion" for the first entry in the response

Observed behavior:
isVersion is set to false

Expected behavior:
isVersion is set to true, which would match the NXQL query which filters on versions

Quick analysis:
JsonDocumentModelRead#getDocumentModel ignores all "ecm" properties from the JSON but "ecm:currentLifeCycleState" : https://github.com/nuxeo/nuxeo/blob/10.10/nuxeo-features/nuxeo-elasticsearch/nuxeo-elasticsearch-core/src/main/java/org/nuxeo/elasticsearch/io/JsonDocumentModelReader.java#L122

=> it's probably the reason why "ecm:isVersion" which is set to "true" is not used to update the DocumentModel