Nested sorting not working as expected ElasticSearch
So, the problem was with case sensitive data. https://www.elastic.co/guide/en/elasticsearch/reference/current/normalizer.html fixed my issue.
"settings": { "analysis": { "normalizer": { "my_normalizer": { "type": "custom", "char_filter": [], "filter": ["lowercase", "asciifolding"] } } } }Now we can use this normalizer with our keyword field type:
field :field_name, type: 'keyword', normalizer: 'my_normalizer'
Hope this was helpful.