Synonym search using .txt file

Elastic Stack Elasticsearch
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https://www.elastic.co/guide/en/elasticsearch/reference/current/analysis-synonym-tokenfilter.html

I'm using synonym search by giving all the synonyms in the file. This file is being indexed at the time of index creation. How can I add more synonyms to this file and use newly added synonyms??

One solution is to reindex the data but my data is around 20GB so I have kept that as a last option.

Thanks

2

Synonyms can be applied to the text of documents at index time or the text of queries at query time.
There are pros and cons to each approach which are listed here: https://www.elastic.co/guide/en/elasticsearch/guide/2.x/synonyms-expand-or-contract.html#synonyms-expansion

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