Does Elasticsearch keep an order of multi-value fields?

Question

Does Elasticsearch keep an order of multi-value fields?

I.e. if I\'ve put following values into fields:

{
    \"values\": [\"one\", \"two\", \"three\         


        

Answer 1

I found out the answer.

Yes, I can rely on Elasticsearch to keep an order of values in multivalue field within a document. (However, when I am performing a search, there is no information available to Elasticsearch about at what position certain term was).

According to documentation:

When you get a document back from Elasticsearch, any arrays will be in the same order as when you indexed the document. The _source field that you get back contains exactly the same JSON document that you indexed.

However, arrays are indexed—made searchable—as multivalue fields, which are unordered. At search time, you can’t refer to “the first element” or “the last element.” Rather, think of an array as a bag of values.

https://www.elastic.co/guide/en/elasticsearch/guide/current/complex-core-fields.html#_multivalue_fields

Answer 2

Elasticsearch - The Definitive Guide says the following:

When you get a document back from Elasticsearch, any arrays will be in the same order as when you indexed the document. The _source field that you get back contains exactly the same JSON document that you indexed.

However, arrays are indexed—made searchable—as multivalue fields, which are unordered. At search time, you can’t refer to “the first element” or “the last element.” Rather, think of an array as a bag of values.

So it seems that for stored fields order is preserved, for indexed fields it's not.