Arthur,
1) That section is only to tell ES how to order documents when the field is
missing. So if you specify for example:
"sort" : [
{ "price" : {"missing" : "_last"} },
]
If the price field is missing, the document will be pushed to the bottom of
the results. But this still does not help when you define multi-fields with
numeric type and want to store a non-numeric string value.
2) It sounds fine to me. You don't even need a multi-field if you don't
care about the string value. So for example, you can do something like this:
"foo": {
"type": "float",
"ignore_malformed": true
}
And then just sort by "foo" numerically.
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