Randomize results with the same score

Elastic Stack Elasticsearch
1

I have indexed documents with lot of not analyzed mostly numeric fields and one analyzed field 'title'. And on that data I built search engine which generates less or more complicated bool queries. In results I need to have full diversity of data so simply I need to use random order if data satisfy query. I achieved it using "function score" with "random_score" and everything seems to be ok at least if query gives me true/false answer. But if I use in query analyzed column (title) full randomization of results is not what I want to achieve. I want to preserve an order based on the orginal score. But if, and only if there are results with the same score I need random order inside groups with the same score.

How to achieve that?

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This can be achieved by using multi sort on your search request. You want your first sort to be on _score, and your second to be a scripted sort which returns a random value.

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