MongoDB get subdocuments array from multiple documents into own array - mongodb

Question

I have the following document structure.
{
"_id" : "0026",
"description" : "test",
"name" : "test",
"options" : [
{
"_id" : "002",
"color" : true,
"visible" : true,
"label" : "sample",
},
{
"_id" : "003",
"color" : true,
"visible" : true,
"label" : "sample",
}
],
},
{
"_id" : "0027",
"description" : "test",
"name" : "test",
"options" : [
{
"_id" : "001",
"color" : true,
"visible" : true,
"label" : "sample",
},
{
"_id" : "002",
"color" : true,
"visible" : true,
"label" : "sample",
}
],
},
I am trying to return one array of only the 'options' subdocuments that match an options label regex search.
I think I'm pretty much there but I seem to getting back a separate array of options for each document, how do I return just one array of 'options'?
My current code is:
{
$match: {
options: {
$elemMatch: {
label: { $regex: '^sample', $options: 'i' },
},
},
},
},
{ "$unwind": '$options' },
{
$project: {
_id: 0,
options: 1,
},
},
The structure I would like back is just an array of options:
[
{
"_id" : "001",
"color" : true,
"visible" : true,
"label" : "sample",
},
{
"_id" : "002",
"color" : true,
"visible" : true,
"label" : "sample",
},
{
"_id" : "002",
"color" : true,
"visible" : true,
"label" : "sample",
},
{
"_id" : "003",
"color" : true,
"visible" : true,
"label" : "sample",
}
]
Ta.

Answer 1

Always the way, you post a question then finally get the answer yourself!
Just needed to add:
{ $replaceRoot: { newRoot: '$options' } }
as the last step.
Full answer:
{
$match: {
options: {
$elemMatch: {
label: { $regex: '^sample', $options: 'i' },
},
},
},
},
{ "$unwind": '$options' },
{
$project: {
_id: 0,
options: 1,
},
},
{ $replaceRoot: { newRoot: '$options' } },