Can you create nested mapping on fields in nested arrays

I'd like to create a mapping on an index, specifying a particular field,
"TCNAME", as a non-analyzed string. This seems straightforward when you're
mapping against a field at the root node, or even a field nested deeper
within a document in cases where there is a predictable pattern of field
names you can use to map down from the root node to the field targeted for
mapping. But the structure against which I'm mapping contains an array
within an array, ultimately embedding a JSON object containing the field
that I want to map.

Here's what it looks like, where TCNAME is the field that I want to map as
a non-analyzed String:

{
"PARENT": "dp::b8632421-a4e4-4709-9a73-6477eece6ca6",
"TYPE": "TER",
"testexecutionrecord": [
[
[
{
"TERID": "073f715d-fade-48b3-97c2-7d2a372204f2",
"TCID": "2c171ef6-32c7-4d7c-b3dd-994a76f6e69c",
"TCNAME": "Credit Card"
}
],
[
{
"Executed On": "01-06-2015",
"Executor": "Stanislas",
"Status": "Pass"
}
]
],
[],
[],
{
"Defect Id": ""
}
]
}

Any thoughts on how I can configure the TCNAME as a nested field in my
Elasticsearch index?

Thank you.

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