On 3/20/2015 4:03 AM, Toke Eskildsen wrote: > On Thu, 2015-03-19 at 15:44 +0100, Shawn Heisey wrote: >> You could in theory write a custom UpdateRequestProcessor that looks for >> the previous document and merges it in whatever way you desire, so the >> combined information is what will be indexed, and configure Solr to use >> that update processor ...but this capability is not available out of the >> box. > > I have not tried it at all, but I thought > https://cwiki.apache.org/confluence/display/solr/Updating+Parts+of > +Documents > was doing exactly what you describe?
Atomic Updates are a special syntax, not the same thing as simply indexing different versions of a document and expecting the search engine to combine them into a single document. Assuming the schema meets the Atomic Update requirements, an update processor could be included with Solr to combine a new document with an existing document, but I doubt everyone would agree on exactly how to combine the info. Within a single document, you might want different fields to behave in different ways ... some fields might replace the existing value with the new value, others might add the new value(s) to a multi-valued field, others might only use the new value if there is no value in the old document, and so on. Thanks, Shawn
