wip adding release highlights

Author: brianseeders

build-tools-internal/src/main/java/org/elasticsearch/gradle/internal/release/ReleaseNotesGenerator.java

@@ -18,10 +18,12 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 import java.util.Set;
 import java.util.TreeMap;
 
 import static java.util.Comparator.comparing;
+import static java.util.Comparator.comparingInt;
 import static java.util.stream.Collectors.groupingBy;
 import static java.util.stream.Collectors.toList;
 
@@ -66,12 +68,23 @@ static void update(File templateFile, File outputFile, QualifiedVersion version,
     static String generateFile(String template, QualifiedVersion version, Set<ChangelogEntry> changelogs) throws IOException {
         final var changelogsByTypeByArea = buildChangelogBreakdown(changelogs);
 
+        final Map<Boolean, List<ChangelogEntry.Highlight>> groupedHighlights = changelogs.stream()
+            .map(ChangelogEntry::getHighlight)
+            .filter(Objects::nonNull)
+            .sorted(comparingInt(ChangelogEntry.Highlight::getPr))
+            .collect(groupingBy(ChangelogEntry.Highlight::isNotable, toList()));
+
+        final List<ChangelogEntry.Highlight> notableHighlights = groupedHighlights.getOrDefault(true, List.of());
+        final List<ChangelogEntry.Highlight> nonNotableHighlights = groupedHighlights.getOrDefault(false, List.of());
+
         final Map<String, Object> bindings = new HashMap<>();
         bindings.put("version", version);
         bindings.put("changelogsByTypeByArea", changelogsByTypeByArea);
         bindings.put("TYPE_LABELS", TYPE_LABELS);
         bindings.put("unqualifiedVersion", version.withoutQualifier());
         bindings.put("versionWithoutSeparator", version.withoutQualifier().toString().replaceAll("\\.", ""));
+        bindings.put("notableHighlights", notableHighlights);
+        bindings.put("nonNotableHighlights", nonNotableHighlights);
 
         return TemplateUtils.render(template, bindings);
     }

build-tools-internal/src/main/resources/templates/index.md

@@ -26,7 +26,24 @@ To check for security updates, go to [Security announcements for the Elastic sta
 
 ## ${unqualifiedVersion} [elasticsearch-${versionWithoutSeparator}-release-notes]
 **Release date:** April 01, 2025
+
 <%
+if (!notableHighlights.isEmpty() || !nonNotableHighlights.isEmpty()) {
+    print "### Highlights\n"
+}
+
+for (highlights in [notableHighlights, nonNotableHighlights]) {
+  if (!highlights.isEmpty()) {
+    for (highlight in highlights) { %>
+::::{dropdown} ${highlight.title}
+${highlight.body.trim()}
+
+For more information, check [PR #${highlight.pr}](https://github.com/elastic/elasticsearch/pull/${highlight.pr}).
+::::
+<% }
+  }
+}
+
 for (changeType in ['features-enhancements', 'fixes', 'regression']) {
     if (changelogsByTypeByArea[changeType] == null || changelogsByTypeByArea[changeType].empty) {
         continue;
@@ -40,7 +57,7 @@ for (changeType in ['features-enhancements', 'fixes', 'regression']) {
         print "* ${change.summary} [#${change.pr}](https://github.com/elastic/elasticsearch/pull/${change.pr})"
         if (change.issues != null && change.issues.empty == false) {
             print change.issues.size() == 1 ? " (issue: " : " (issues: "
-            print change.issues.collect { "{es-issue}${it}[#${it}]" }.join(", ")
+            print change.issues.collect { "[#${change.pr}](https://github.com/elastic/elasticsearch/pull/${change.pr})" }.join(", ")
             print ")"
         }
         print "\n"