Question about update by query

I would like to partial update documents per query.
Seems this is not implemented in ES yet, the only way is to use the update
by query plug-in.

I checked the example in above site, and know how to update numeric field
by script:

curl -XPOST 'localhost:9200/twitter/_update_by_query' -d '{ "query" : { "term" : { "message" : "you" } }, "script" : "ctx._source.likes += 1"}'

But I still have no idea how to update a text field by query. Example, if I
have a following doc:
{"title":"hello", "text":"my text"}

I like something like this:
{
"query" : {
"match" : {
"title" : "hello"
}
},
"doc" : {
"text" :"new text"
}
}

How can I do?

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