UpdateByQuery plugin problem

I want to update records in ElasticSearch by query. For this purpose I used
UpdateByQuery plugin, but I can't figure out
how to force it to work properly. Here my updateByQuery:
"query": {
"term": {
"patix_id": "87344"
"script": "ctx._source.firstName = "TEST""
For it I get this response:
ok: true
took: 30
total: 1
updated: 0
indices: [
reception: { }
I don't know why this query is not updating anything (updated: 0)
although it can find the target row (total: 1).
What I'm doing wrong? The updated record ("patix_id": "87344") surely
exists in ElasticSearch index (reception).
I use 'ElasticSearch 1.3.2' and


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