Cannot access doc['field'].value in ElasticSearch aggregation script

Anyone have some insight re: the following aggregation? I cannot access any
properties of the document in my script.

With the following query:

{
"query": {
"filtered": {
"filter": [],
"query": {
"bool": {
"must": [
{
"query_string": {
"fields": [
"title"
],
"query": "test"
}
}
]
}
}
}
},
"aggs": {
"my_field": {
"terms": {
"field": "my_field.name.raw",
"script": "doc['title'].value"
}
}
}
}

I get the following error:

QueryPhaseExecutionException[[index_name][2]:
query[title:test],from[0],size[10]: Query Failed [Failed to execute main
query]]; nested: PropertyAccessException[[Error: doc['title'].value: null]
[Near : {... doc['title'].value ....}] ^ [Line: 1, Column: 1]]; nested:
InvocationTargetException; nested: ArrayIndexOutOfBoundsException;

I also try using _source.title, doc.get('title').value, and other
combinations of the doc['field'] syntax - none are working for me. Is there
a special nuance for using script within an aggregation? Am I missing
something obvious?

This fails on both ES 1.1.1 and 1.2.0.

(also posted on StackOverflow
http://stackoverflow.com/questions/23815993/cannot-access-docfield-value-in-elasticsearch-aggregation-script)

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