Elasticsearch Updating / Deleting Nested - php

Question

I've gone through a few examples and documentations and kind find a solution update a nested object in the this result set.
I can add one (if one does not exist)
I can append to it (if one does exist)
Can't figure out how to delete a selected entry.
Is there a method I can use (using the php client) to add an entry if it does not exist / update an entry if it does exist / delete the second entry.
I'm inheriting this problem and am new to Elastic search.
Thanks.
{
"took": 1,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"failed": 0
},
"hits": {
"total": 1,
"max_score": 1,
"hits": [
{
"_index": "products",
"_type": "categories",
"_id": "AUpRjtKZfXI7LIe9OpNx",
"_score": 1,
"_source": {
"name": "Primary",
"description": "Primary Category",
"slug": "Primary",
"created": "2014-12-16 00:25:22",
"parent": [
{
"name": "First One",
"description": "Test",
"id": "ae74ea4e2e865ed3fd60c18a06e69c65",
"slug": "first-one"
},
{
"name": "Second One",
"description": "Testing Again",
"id": "c8dbe5143c8dfd6957fa33e6cea7a0a8",
"slug": "second-one"
}
]
}
}
]
}
}

Answer 1

Do you want to do all three in the same operation?
Deleting the second nested object is achieved through a script which removes the second element:
PUT /products
{
"mappings": {
"categories": {
"properties": {
"parent": {
"type": "nested",
"properties": {
"name": { "type": "string" },
"description": { "type": "string" },
"id": { "type": "string", "index": "not_analyzed" },
"slug": { "type": "string" }
}
}
}
}
}
}
PUT /products/categories/1
{
"name": "Primary",
"description": "Primary Category",
"slug": "Primary",
"created": "2014-12-16 00:25:22",
"parent": [
{
"name": "First One",
"description": "Test",
"id": "ae74ea4e2e865ed3fd60c18a06e69c65",
"slug": "first-one"
},
{
"name": "Second One",
"description": "Testing Again",
"id": "c8dbe5143c8dfd6957fa33e6cea7a0a8",
"slug": "second-one"
}
]
}
POST /products/categories/1/_update
{
"script" : "ctx._source.parent.remove(1)",
"lang": "groovy"
}
GET /products/categories/1
So in PHP code (using the official PHP client), the update would look like:
$params = [
'index' => 'products',
'type' => 'categories',
'id' => 1,
'body' => [
'script' => 'ctx._source.parent.remove(1)',
'lang' => 'groovy'
]
];
$result = $client->update($params);