Does solr allow updating specific field rather than indexing entire document.
I know solr 1.4 doesn’t.
Has this been implemented in newer versions?
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Nope. Solr doesn’t allow updating a specific field.
You would need to update the document again with all the existing values and the changed values.
The Update basically is delete and add of the document.
Update
Solr does Allow Partial Updates with 4.0 @ http://solr.pl/en/2012/07/09/solr-4-0-partial-documents-update/