Elasticsearch mapping

I am using User dictionary rules in Kuromoji tokenizer in ES mapping.

When I am feeding my data to Elasticsearch cluster it mapped some of the keywords strangely
like keyword 禰󠄀豆子.

I got that ES normalizes the "禰󠄀豆子" => "禰󠄀 豆子" with a space after 禰󠄀 kanji and my user dictionary rules are showing like this after mapping.
"user_dictionary_rules" : [

But it should be
"user_dictionary_rules" : [

How do I fix this or where can I find more information about this issue?

Thank you.

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