Use Update Processor in nested fileds (nested documents)

[dsaewqdsa]

Hi,
I want to use update Processor of solr, on nested fields,
for example:
Use UniqFieldsUpdateProcessorFactory, on field: "subject" in documents:
{
"id":"dsaewqhgfytr",
"lecturers":[
{
"id":"dsaewqhgfytr.dsadsa321321dsa",
"subject":"english"
},
{
"id":"dsaewqhgfytr.dsadsa321321ewq",
"subject":"math"
}
]}

is it possible? how can I do it?