You'll have to change the query a bit. Try something like this:
{
"query": {
"bool": {
"filter": {
"terms": {
"Identifiant": [
"CASA-R1000",
"CASA-R1001"
]
}
}
}
}
}
That will show results for CASA-R100 OR CASA-R1001 so you'll have to then negate the filter if you want none of those to show up.