Will analyzers applicable to existing documents?

Hi Team,
Hope you are doing great..! I'm new to elasticsearch.
I have an index with 100 document's. Now as per customer requirement i have created a new custom analyzer, now my question is i want that 100 documents analysed under my new analyzer.
What is the procedure to get those 100 documents stored under my new custom analyzer.

Thanks in advance...

Welcome.

You need to reindex the data.

Thanks alot dadoonet.........