Fix routing_path when template has multiple path_match and multi-fields

docs/changelog/104418.yaml

@@ -0,0 +1,6 @@
+pr: 104418
+summary: Fix `routing_path` when template has multiple `path_match` and multi-fields
+area: TSDB
+type: bug
+issues:
+ - 104400

modules/data-streams/src/main/java/org/elasticsearch/datastreams/DataStreamIndexSettingsProvider.java

@@ -31,7 +31,6 @@
 import java.io.UncheckedIOException;
 import java.time.Instant;
 import java.util.ArrayList;
-import java.util.HashMap;
 import java.util.List;
 import java.util.Locale;
 
@@ -182,7 +181,8 @@ private List<String> findRoutingPaths(String indexName, Settings allSettings, Li
  // Since FieldMapper.parse modifies the Map passed in (removing entries for "type"), that means
  // that only the first pathMatch passed in gets recognized as a time_series_dimension. To counteract
  // that, we wrap the mappingSnippet in a new HashMap for each pathMatch instance.
- .parse(pathMatch, new HashMap<>(mappingSnippet), parserContext)
+ // Note that a shallow copy of the map is not enough if there are multi-fields.
+ .parse(pathMatch, template.mappingForName(templateName, KeywordFieldMapper.CONTENT_TYPE), parserContext)
  .build(MapperBuilderContext.root(false, false));
  extractPath(routingPaths, mapper);
  }

modules/data-streams/src/test/java/org/elasticsearch/datastreams/DataStreamIndexSettingsProviderTests.java

@@ -493,6 +493,55 @@ public void testGenerateRoutingPathFromDynamicTemplateWithMultiplePathMatchEntri
  assertEquals(3, routingPathList.size());
  }
 
+ public void testGenerateRoutingPathFromDynamicTemplateWithMultiplePathMatchEntriesMultiFields() throws Exception {
+ Instant now = Instant.now().truncatedTo(ChronoUnit.SECONDS);
+ String mapping = """
+ {
+ "_doc": {
+ "dynamic_templates": [
+ {
+ "labels": {
+ "path_match": ["xprometheus.labels.*", "yprometheus.labels.*"],
+ "mapping": {
+ "type": "keyword",
+ "time_series_dimension": true,
+ "fields": {
+ "text": {
+ "type": "text"
+ }
+ }
+ }
+ }
+ }
+ ],
+ "properties": {
+ "host": {
+ "properties": {
+ "id": {
+ "type": "keyword",
+ "time_series_dimension": true
+ }
+ }
+ },
+ "another_field": {
+ "type": "keyword"
+ }
+ }
+ }
+ }
+ """;
+ Settings result = generateTsdbSettings(mapping, now);
+ assertThat(result.size(), equalTo(3));
+ assertThat(IndexSettings.TIME_SERIES_START_TIME.get(result), equalTo(now.minusMillis(DEFAULT_LOOK_BACK_TIME.getMillis())));
+ assertThat(IndexSettings.TIME_SERIES_END_TIME.get(result), equalTo(now.plusMillis(DEFAULT_LOOK_AHEAD_TIME.getMillis())));
+ assertThat(
+ IndexMetadata.INDEX_ROUTING_PATH.get(result),
+ containsInAnyOrder("host.id", "xprometheus.labels.*", "yprometheus.labels.*")
+ );
+ List<String> routingPathList = IndexMetadata.INDEX_ROUTING_PATH.get(result);
+ assertEquals(3, routingPathList.size());
+ }
+
  public void testGenerateRoutingPathFromDynamicTemplate_templateWithNoPathMatch() throws Exception {
  Instant now = Instant.now().truncatedTo(ChronoUnit.SECONDS);
  String mapping = """