How to properly add an ngram tokenizer via Nest

We have an existing Elastic version 8.3.3 with a .Net implementation using Nest 7.17.5.

I've been trying to add a new field utitlizing an ngram tokenizer but whenever I add the code to my analyzers the existing full_autocomplete analyzer is failing to be recognized.

"query_shard_exception\",\"reason\":\"[multi_match] analyzer [full_autocomplete] not found\"

As far as I can tell from reviewing documentation and other forum questions I'm formatting this correctly. Can anyone point out where I might be going wrong?

Code example in case the embed link fails.
If I remove the ngram code and reindex the full_autocomplete analyzer works again.

Thanks for your help in advance.

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