elasticsearch. How to get to store vectors (arrays) and get the Euclidean distance for the required query?

Question

elasticsearch

Good afternoon.
A couple of follow up questions.
1. I want to store arrays of images obtained from numpy (Python)
Arrays, for example, are like this: [1.1, 2.2, 3.3, 4.4, 5.5, 6.6]
How can they be indexed?
2. Suppose they are indexed.
We have an array [1.2, 2.4, 3.5, 4.9, 5.0, 6.7]
It is not in the index. But you need to get as similar as possible to it.
Ideally, when requesting, receive several responses of the form:

1. - массив
    - число евклидовой дистанции
2. - массив
    - число евклидовой дистанции
3. - массив
    - число евклидовой дистанции

Something similar is announced in future versions.
But I would like to know if there are any solutions now? Plugins?
thanks in advance