Arthur,
Can you try to set "ignore_malformed": true for your float field and see if
that works. Something like this:
"foo": {
"type": "multi_field",
"fields": {
"foo": {
"type": "string",
"index": "not_analyzed"
},
"f": {
"type": "float",
"ignore_malformed": true
}
}
}
After that, you should be able to sort numerically on the field "foo.f".
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