The text which appears after a highlighted term.

The default value is "</em>"

If a snippet cannot be generated (due to no terms matching), you can specify a field to use as the backup/default summary. The default value is to not have a default summary.

The text which appears before a highlighted term. The default value is "<em>".

List of fields to generate highlighted snippets for. If left blank, the fields highlighted for the StandardRequestHandler are the defaultSearchField (or the df param if used) and for the DisMaxRequestHandler the qf fields are used.

Specify a text snippet generator for highlighted text. This parameter makes sense for Highlighter only. The default value is "gap".

The size, in characters, of fragments to consider for highlighting. 0 indicates that the whole field value should be used (no fragmenting). If left null, it will use whatever default Solr sets (100 for Solr 1.3)

If the SpanScorer is also being used, enables highlighting for range/wildcard/fuzzy/prefix queries. This parameter makes sense for Highlighter only. The default is "false".

If hl.alternateField is specified, this parameter specifies the maximum number of characters of the field to return. Any value less than or equal to 0 means unlimited. The default value is unlimited.

How many characters into a document to look for suitable snippets. This parameter makes sense for Highlighter only. The default value is "51200".

Collapse contiguous fragments into a single fragment. "true" indicates contiguous fragments will be collapsed into single fragment. This parameter makes sense for Highlighter only. The default value is "false", which is also the backward-compatible setting.

Only analyze this many characters from a field when using the regex fragmenter (after which, the fragmenter produces fixed-sized fragments). Applying a complicated regex to a huge field is expensive. The default value is "10000".

The regular expression for fragmenting. This could be used to extract sentences.

Factor by which the regex fragmenter can stray from the ideal fragment size (given by hl.fragsize) to accomodate the regular expression. For instance, a slop of 0.2 with fragsize of 100 should yield fragments between 80 and 120 characters in length. It is usually good to provide a slightly smaller fragsize when using the regex fragmenter. The default value is ".6".

If true, then a field will only be highlighted if the query matched in this particular field (normally, terms are highlighted in all requested fields regardless of which field matched the query). If left null, it will use whatever default Solr sets (false for Solr 1.3)

The maximum number of highlighted snippets to generate per field. It is possible for any number of snippets from zero to this value to be generated. If left null, it will use whatever default Solr sets (1 for Solr 1.3)

Uses FastVectorHighlighter (Solr 3.1+). FastVectorHighlighter requires the field is termVectors=on, termPositions=on and termOffsets=on. The default value is "false".

Use SpanScorer to highlight phrase terms only when they appear within the query phrase in the document. Default value is "false".