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dsmiley pushed a commit to branch branch_9x
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commit 48999b0d5d88c6a93c73794e92f8558b00ec60aa
Author: David Smiley <[email protected]>
AuthorDate: Tue Jul 14 09:02:29 2026 -0400

    SOLR-17715: un-deprecate CommonParams.QT (#4461)
    
    (cherry picked from commit 51557ecf3f97d4ded66146aedc22555c9844ee62)
    (cherry picked from commit aa5179dbb9ded8879820bc0ccd799694e6153e3a)
---
 changelog/unreleased/SOLR-17715-undeprecate-qt.yml          |  8 ++++++++
 .../src/java/org/apache/solr/client/solrj/SolrQuery.java    | 13 ++++++++-----
 .../java/org/apache/solr/common/params/CommonParams.java    |  9 +++++----
 3 files changed, 21 insertions(+), 9 deletions(-)

diff --git a/changelog/unreleased/SOLR-17715-undeprecate-qt.yml 
b/changelog/unreleased/SOLR-17715-undeprecate-qt.yml
new file mode 100644
index 00000000000..80773d6449e
--- /dev/null
+++ b/changelog/unreleased/SOLR-17715-undeprecate-qt.yml
@@ -0,0 +1,8 @@
+title: Un-deprecate 'qt' for certain use-cases where there's no alternative.
+type: deprecated
+authors:
+  - name: David Smiley
+    nick: dsmiley
+links:
+  - name: SOLR-17715
+    url: https://issues.apache.org/jira/browse/SOLR-17715
diff --git a/solr/solrj/src/java/org/apache/solr/client/solrj/SolrQuery.java 
b/solr/solrj/src/java/org/apache/solr/client/solrj/SolrQuery.java
index 8bc477b2fc1..07068b2be8e 100644
--- a/solr/solrj/src/java/org/apache/solr/client/solrj/SolrQuery.java
+++ b/solr/solrj/src/java/org/apache/solr/client/solrj/SolrQuery.java
@@ -22,6 +22,7 @@ import java.util.Date;
 import java.util.List;
 import java.util.Locale;
 import java.util.regex.Pattern;
+import org.apache.solr.client.solrj.request.QueryRequest;
 import org.apache.solr.common.params.CommonParams;
 import org.apache.solr.common.params.FacetParams;
 import org.apache.solr.common.params.HighlightParams;
@@ -1132,14 +1133,16 @@ public class SolrQuery extends ModifiableSolrParams {
   }
 
   /**
-   * The Request Handler to use (see the solrconfig.xml), which is stored in 
the "qt" parameter.
-   * Normally it starts with a '/' and if so it will be used by {@link
-   * org.apache.solr.client.solrj.request.QueryRequest#getPath()} in the URL 
instead of the "qt"
-   * parameter. If this is left blank, then the default of "/select" is 
assumed.
+   * The Request Handler to use (see the solrconfig.xml), starting with a '/'. 
This isn't passed to
+   * Solr as a parameter; instead {@link QueryRequest} uses it for the path. 
QueryRequest uses
+   * "/select" if no path or request-handler is provided. Since this isn't 
<em>really</em> a
+   * parameter in practice, it's preferrable to set this in the constructor of 
QueryRequest, or the
+   * setter instead.
    *
    * @param qt The Request Handler name corresponding to one in solrconfig.xml 
on the server.
    * @return this
-   * @deprecated Use {@link SolrRequest#setPath(String)}
+   * @deprecated use QueryRequest#QueryRequest(String, SolrParams)
+   * @see SolrRequest#setPath(String)
    */
   @Deprecated
   public SolrQuery setRequestHandler(String qt) {
diff --git 
a/solr/solrj/src/java/org/apache/solr/common/params/CommonParams.java 
b/solr/solrj/src/java/org/apache/solr/common/params/CommonParams.java
index 57f091d3463..f6c113b97ba 100644
--- a/solr/solrj/src/java/org/apache/solr/common/params/CommonParams.java
+++ b/solr/solrj/src/java/org/apache/solr/common/params/CommonParams.java
@@ -36,12 +36,13 @@ public interface CommonParams {
   String TZ = "TZ";
 
   /**
-   * the Request Handler (formerly known as the Query Type) - which Request 
Handler should handle
-   * the request.
+   * the Request Handler (formerly known as the Query Type) to route to as 
seen in solrconfig.xml.
    *
-   * @deprecated route requests by path instead, not using this parameter
+   * <p>Note: in a standard request, the handler is the last path component of 
the URL, not this
+   * parameter. This parameter is used for special cases when there is no path 
like a warming query
+   * or streaming expressions or some other places.
    */
-  @Deprecated String QT = "qt";
+  String QT = "qt";
 
   /** the response writer type - the format of the response */
   String WT = "wt";

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