How to cancel update in elasticsearch painless script - php

Question

While working on trying to switch out PHP code with pure elasticsearch-painless, I noticed that the document doesn't return "noop" even if the document is identical before and after update.
I'm not sure if there is any consequences of having a version update for every time the code is executed? How does it scale?
I'm simply trying to update the views of a post during visit if the identity was not found in views_log, and was wondering either if there is a way to fix the "noop" return, or somehow have it cancel the update?
The code I have right now looks like this:
$script = 'if (!ctx._source.views_log.contains(params.identity)) {
ctx._source.views_log.add(params.identity);
ctx._source.views += 1;
}';
$params = [
'index' => 'post',
'id' => 4861,
'body' => [
'script' => [
'source' => $script,
'lang' => "painless",
'params' => [
'identity' => $identifier
]
]
]
];
$response = $client->update($params);
Following elasticsearch's documentation:
ctx['op']:
Use the default of index to update a document. Set to none to specify no operation or delete to delete the current document from the index.
I tried setting ctx.op to none if the condition is not met, but that didn't seem to work.

Answer 1

During writing of this question I figured it out, and might as well share with others.
none is an accepted keyword for ctx.op, it accepts a string. Change none to "none".
So the full script should look like this:
$script = 'if (!ctx._source.views_log.contains(params.identity)) {
ctx._source.views_log.add(params.identity);
ctx._source.views += 1;
} else {
ctx.op = "none";
}';
$params = [
'index' => 'post',
'id' => 4861,
'body' => [
'script' => [
'source' => $script,
'lang' => "painless",
'params' => [
'identity' => $identifier
]
]
]
];
$response = $client->update($params);
This will give the desired "result": "noop"