[GitHub] [lucene-solr] dsmiley commented on a change in pull request #1819: SOLR-14782: Document how to unescape for the QueryElevationComponent.

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dsmiley commented on a change in pull request #1819:
URL: https://github.com/apache/lucene-solr/pull/1819#discussion_r482097781



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File path: solr/solr-ref-guide/src/the-query-elevation-component.adoc
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@@ -61,7 +61,18 @@ Optionally, in the Query Elevation Component configuration you can also specify
 The Query Elevation Search Component takes the following parameters:
 
 `queryFieldType`::
-Specifies which fieldType should be used to analyze the incoming text. For example, it may be appropriate to use a fieldType with a LowerCaseFilter.
+Specifies which fieldType should be used to analyze the incoming text. For example, it may be appropriate to use a fieldType with a LowerCaseFilter. Other example, if you need to unescape backslash-escaped queries, then you can define the fieldType to preprocess with a PatternReplaceCharFilter. Here is the corresponding example of fieldType (traditionally in `schema.xml`):
+
+[source,xml]
+----
+<fieldType name="unescapelowercase" class="solr.TextField">
+  <analyzer>
+    <charFilter class="solr.PatternReplaceCharFilterFactory" pattern="\\(.)" replacement="$1"/>

Review comment:
       I think there's a syntax to use such that we only un-escape non-alphanumeric?  If they type a\b (which might be in some identifier) then they probably meant that.




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