Field boosting in elasticsearch with django-haystack

Field boosting in elasticsearch with django-haystack

We're trying to implement field boosting in Elasticsearch using Django
Haystack 2.1.0 and pyelasticsearch 0.6. If I curl -XGET
"http://localhost:9200/_mapping?pretty=true, I get a response (extraneous
parts removed) of
{
"haystack" : {
"modelresult" : {
"_boost" : {
"name" : "boost",
"null_value" : 1.0
},
"properties" : {
"headline" : {
"type" : "string",
"boost" : 1.5,
"analyzer" : "snowball",
"store" : "yes",
"term_vector" : "with_positions_offsets"
},
}
}
}
So far we're only trying to boost the "headline" field. Even using a boost
of something absurd like 5000 shows no effect on the output. Is there
something we're missing?