Updating Parts of Documents - Apache Solr Reference Guide - Apache Software Foundation



set
Set or replace the field value(s) with the specified value(s), or remove the values if 'null' or empty list is specified as the new value.
May be specified as a single value, or as a list for multivalued fields
add
Adds the specified values to a multivalued field.
May be specified as a single value, or as a list.
remove
Removes (all occurrences of) the specified values from a multivalued field.
May be specified as a single value, or as a list.
inc
Increments a numeric value by a specific amount.
Must be specified as a single numeric value.
Implementation here:
https://issues.apache.org/jira/browse/SOLR-3862

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