Yes you must delete the entire document and then re-index a new one, to update a single Field.
There is some work underway, or at least a Jira issue opened, towards improving this situation, here:
https://issues.apache.org/jira/browse/LUCENE-1231 But it will be some time before that's available. Mike Aditi Goyal wrote:
Hi, I want to modify a field on the current index. Can it be done? For what I have heard that we cannot update the index . It has to be reindexed by deleting and then indexing again. Thanks, Aditi
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