Cherry-pick #20218 to 7.x: Increase index.max_docvalue_fields_search …

…to 200 (#20222)

* Increase index.max_docvalue_fields_search to 200 (#20218)

The number of docvalue fields in Filebeat went beyond 100 and Discover was not loading.
I added settings.index.max_docvalue_fields_search=200 to the default index template.
In Filebeat there are about 117 fields now.

Fixes #20215

(cherry picked from commit e95a905)

CHANGELOG.next.asciidoc

@@ -430,6 +430,7 @@ field. You can revert this change by configuring tags for the module and omittin
 - Add the `overwrite_keys` configuration option to the dissect processor. {pull}19464[19464]
 - Add support to trim captured values in the dissect processor. {pull}19464[19464]
 - Added the `max_cached_sessions` option to the script processor. {pull}19562[19562]
+- Set index.max_docvalue_fields_search in index template to increase value to 200 fields. {issue}20215[20215]
 - Add capability of enriching process metadata with contianer id also for non-privileged containers in `add_process_metadata` processor. {pull}19767[19767]
 
 *Auditbeat*

libbeat/template/template.go

@@ -32,9 +32,10 @@ import (
 
 var (
 	// Defaults used in the template
-	defaultDateDetection         = false
-	defaultTotalFieldsLimit      = 10000
-	defaultNumberOfRoutingShards = 30
+	defaultDateDetection           = false
+	defaultTotalFieldsLimit        = 10000
+	defaultNumberOfRoutingShards   = 30
+	defaultMaxDocvalueFieldsSearch = 200
 
 	// Array to store dynamicTemplate parts in
 	dynamicTemplates []common.MapStr
@@ -325,6 +326,10 @@ func buildIdxSettings(ver common.Version, userSettings common.MapStr) common.Map
 		indexSettings.Put("query.default_field", fields)
 	}
 
+	if ver.Major >= 6 {
+		indexSettings.Put("max_docvalue_fields_search", defaultMaxDocvalueFieldsSearch)
+	}
+
 	indexSettings.DeepUpdate(userSettings)
 	return indexSettings
 }

libbeat/template/template_test.go

@@ -113,20 +113,23 @@ func TestTemplate(t *testing.T) {
 		template.Assert("index_patterns", []string{"testbeat-" + currentVersion + "-*"})
 		template.Assert("order", 1)
 		template.Assert("mappings.doc._meta", common.MapStr{"beat": "testbeat", "version": currentVersion})
+		template.Assert("settings.index.max_docvalue_fields_search", 200)
 	})
 
 	t.Run("for ES 7.x", func(t *testing.T) {
 		template := createTestTemplate(t, currentVersion, "7.2.0", DefaultConfig())
 		template.Assert("index_patterns", []string{"testbeat-" + currentVersion + "-*"})
 		template.Assert("order", 1)
 		template.Assert("mappings._meta", common.MapStr{"beat": "testbeat", "version": currentVersion})
+		template.Assert("settings.index.max_docvalue_fields_search", 200)
 	})
 
 	t.Run("for ES 8.x", func(t *testing.T) {
 		template := createTestTemplate(t, currentVersion, "8.0.0", DefaultConfig())
 		template.Assert("index_patterns", []string{"testbeat-" + currentVersion + "-*"})
 		template.Assert("order", 1)
 		template.Assert("mappings._meta", common.MapStr{"beat": "testbeat", "version": currentVersion})
+		template.Assert("settings.index.max_docvalue_fields_search", 200)
 	})
 }