Updation of mapping out deletion of index

Hello guyz ,
I have created an index with a custom analyzer having a filter for
autocompletion . Now i also want to add tokenizer for Synonyms to my index .
I always need to delete the index mapping and then again create new index
for new setting .
Is it possible to update mapping without deleting the index and apply it to
the already stored records also .

You received this message because you are subscribed to the Google Groups "elasticsearch" group.
To unsubscribe from this group and stop receiving emails from it, send an email to elasticsearch+unsubscribe@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/elasticsearch/2acdc6e4-48b1-4279-9113-ed308059810e%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.