How to dynamically search from mutiple offset inside an index in elastic search?

Elastic Stack Elasticsearch
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Say I have a string indexed and I want to take out a substring from it at the time of search query. How will I achieve this?

For example -

String to be indexed -

"The quick brown fox"

Searches that I want to make -

- "the"
- "thequ"
- "quick"
- "th"
- "quick the"

How should I do this if I am working with Django and elasticsearch?

I have tried to use ngrams and have merged the whole string to create an n gram index for every combination possible. This is on the code side, How to do this with elastic search.

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