Elasticsearch sorting on an unmapped field fails

Sorting on a field that is not explicitly defined in the mapping and that has never been submited via a document fails with:

Failed to execute phase [dfs], all shards failed; shardFailures ... Parse Failure [No mapping found for [my:field] in order to sort on]

A possible work around is to define the field in the Nuxeo Elasticsearch mapping:

"my:field" : {
   "type" : "string"
}

or to create a document with non empty field.

This could be fixed by adding an unmapped_type sort option as describe here:
https://www.elastic.co/guide/en/elasticsearch/reference/1.5/search-request-sort.html
–
No more SearchParseException on unmapped/unindexed field when sorting, we now using the unmappedType sort option.