Why Completion Suggester with Edge Ngram analyzer takes 15 to 17 times more index size as compared to default

Elastic Stack Elasticsearch
2

You have a price to pay:

  • At index time, using ngrams: that's slowing down the ingestion and take much more space
  • At search time, using wildcards: that's slowing down the search.

Something you can look at: https://www.elastic.co/guide/en/elasticsearch/reference/current/search-suggesters.html

May be that can help but I'm not sure though.