indexing.collapse_fields
Background
Defines the fields used for result collapsing.
The collapsing fields are sequences of metadata class
characters separated by commas. The characters $ and # are special metadata class characters for result collapsing,
representing document summary text and document URL respectively. Commas are used to separate
columns which can be selected at query time using the appropriate query processor option.
Setting the key
Set this configuration key in the search package or data source configuration.
Use the configuration key editor to add or edit the indexing.collapse_fields key, and set the value. This can be set to any valid String value.
Examples
Generate 2 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:
indexing.collapse_fields=[$],[t,a]Notes
-
When
tis used as the collapsing field, collapsing will apply for the actual value of thetmetadata, which may be different from the document title. The best way to understand the differences is to display both the result title, and the value of thetmetadata next to each other (Using the JSON or XML endpoint and the&SM=meta&SF=[t]CGI parameters). Usually,twill be multi-valued as the default metadata mapping maps it to different title fields and HTML h1-h4 headers.