elasticsearch filtering by the size of a field that is an array

Question

How can I filter documents that have a field which is an array and has more than N elements?

How can I filter documents that have a field which is an empty array?

Answer 1

Based on this: https://code.google.com/p/guava-libraries/source/browse/guava/src/com/google/common/collect/RegularImmutableList.java?r=707f3a276d4ea8e9d53621d137febb00cd2128da

And on lisak's answer here.

There is size() function which returns the length of list:

"filter" : {
    "script" : {
        "script" : "doc['fieldname'].values.size() > 10"
    }
}