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The result collapsing index files are built by the padre-cc program. The documentation says you need to rebuild the index but you can skip this and build the collapsing manually. You may wish to do this if you have a large index that takes a long time to build.
Usage for padre-cc can be seen by running the program without arguments:
[search@funnelback ~]$ /opt/funnelback/bin/padre-cc Purpose: To build an index.collapsig file to permit use of collapsed rankings. Usage: /opt/funnelback/bin/padre-cc <index_stem> [-collapse_control=<string>] [-debug=on] Utility for building a .collapsig file of collapsing signatures. If no control_string is given, a one-column file is built using the signatures from the .textsig file. The collapse_control string must consist of sequences of metadata field characters (ASCII letters or digits) separated by commas. The characters $ and # may be used as metadata field characters and represent document summarisable text and document URL respectively. In future, it is planned to allow field characters to be followed by a regular expression, indicating that only the part of the metadata string which matches the regex should be used in calculating the signature. Example current control string: '$,ta'. In this case the .collapsig will have two signatures per document: Column 0 is the normal document signature and column 1 is a signature derived from the concatenation of metadata fields t and a, in that order.
You can view the collapsing command that was run automatically during a collection's update by looking at the collection's update log.
In the Index section look for the line Index: COLLAPSIG - this will the show the command that was used to build collapsing for a collection.
If you wish to manually build collapsing on an existing (live) index you can run the command manually:
This should create an index.collapsig file in the index folder for the collection.