Remove object from list based on attribute value

In ES 6, I have indexed the following doc:

PUT test/doc/_bulk?refresh

I need to remove the element from "prop2" that has a value of "456" for "a"

The remove() method in Painless needs an index, so I can do this:

POST /test/1/_update
"script": {
"lang": "painless",
"source": "ctx._source.list.remove(ctx._source.list.indexOf(params.obj))",
"params" : {"obj" : {"a": "456"}}  

The problem is that each object in prop2 actually has a dozen other keys with varying values - so I can't isolate the element with a param. It requires some kind of query or filter to say "delete any element that has a value of '456' for 'a'."

In Python, if I have a list like so:

l=[{'a': '123', "b": '321'}, {'a': '456','b':'654'}]

I can get the index I need using one attribute with this:

[l.index(x) for x in l if x['a'] == '456'][0]

But I can't figure out the Painless approach (don't know Java, btw). Tried several things; this fails with a script compile error:

POST /test/doc/1/_update
  "script": {
    "lang": "painless",
    "source": """
      l = ctx._source.list
      for (x in l){
        if (x['a'] == '456') {
          idx = l.indexOf(x) 

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