[bug 1055520] Update to ElasticUtils v0.10

This updates elasticutils to v0.10 which should work with both
Elasticsearch 0.90 and 1.0.

r?
This is the API view which uses `.values_dict()`. I didn't want to change the shape of the API results because that requires a new API version plus `.values_dict()` returns all values as lists and that's kind of dumb.

Thus we "reshape" the result and singularize the values that should be singular and thus our API results continue to stay the same.