diff --git a/modules/reindex/build.gradle b/modules/reindex/build.gradle
index fd6c6584d233c..cb503f0961eff 100644
--- a/modules/reindex/build.gradle
+++ b/modules/reindex/build.gradle
@@ -32,6 +32,9 @@ testClusters.configureEach {
   module ':modules:lang-painless'
   // Whitelist reindexing from the local node so we can test reindex-from-remote.
   setting 'reindex.remote.whitelist', '127.0.0.1:*'
+  if (BuildParams.isSnapshotBuild() == false) {
+    systemProperty 'es.index_mode_feature_flag_registered', 'true'
+  }
 }
 
 dependencies {
@@ -173,4 +176,3 @@ tasks.named("yamlRestTestV7CompatTransform").configure { task ->
 
     task.addAllowedWarningRegex("\\[types removal\\].*")
 }
-
diff --git a/plugins/analysis-icu/build.gradle b/plugins/analysis-icu/build.gradle
index 05a741fe51793..b10ca2b6dd495 100644
--- a/plugins/analysis-icu/build.gradle
+++ b/plugins/analysis-icu/build.gradle
@@ -1,3 +1,5 @@
+import org.elasticsearch.gradle.internal.info.BuildParams
+
 /*
  * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
  * or more contributor license agreements. Licensed under the Elastic License
@@ -25,6 +27,12 @@ dependencies {
   api "com.ibm.icu:icu4j:${versions.icu4j}"
 }
 
+if (BuildParams.isSnapshotBuild() == false) {
+  tasks.named("test").configure {
+    systemProperty 'es.index_mode_feature_flag_registered', 'true'
+  }
+}
+
 restResources {
   restApi {
     include '_common', 'indices', 'index', 'search'
diff --git a/plugins/mapper-annotated-text/build.gradle b/plugins/mapper-annotated-text/build.gradle
index 6d8569435d85e..98ef6074c8a6b 100644
--- a/plugins/mapper-annotated-text/build.gradle
+++ b/plugins/mapper-annotated-text/build.gradle
@@ -1,3 +1,5 @@
+import org.elasticsearch.gradle.internal.info.BuildParams
+
 /*
  * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
  * or more contributor license agreements. Licensed under the Elastic License
@@ -14,6 +16,12 @@ esplugin {
   classname 'org.elasticsearch.index.mapper.annotatedtext.AnnotatedTextPlugin'
 }
 
+if (BuildParams.isSnapshotBuild() == false) {
+  tasks.named("internalClusterTest").configure {
+    systemProperty 'es.index_mode_feature_flag_registered', 'true'
+  }
+}
+
 restResources {
   restApi {
     include '_common', 'indices', 'index', 'search'
diff --git a/plugins/mapper-murmur3/build.gradle b/plugins/mapper-murmur3/build.gradle
index e6a4183139cbf..6243871ef3bd0 100644
--- a/plugins/mapper-murmur3/build.gradle
+++ b/plugins/mapper-murmur3/build.gradle
@@ -1,3 +1,5 @@
+import org.elasticsearch.gradle.internal.info.BuildParams
+
 /*
  * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
  * or more contributor license agreements. Licensed under the Elastic License
@@ -19,6 +21,12 @@ dependencies {
   testImplementation project(':modules:lang-painless')
 }
 
+if (BuildParams.isSnapshotBuild() == false) {
+  tasks.named("test").configure {
+    systemProperty 'es.index_mode_feature_flag_registered', 'true'
+  }
+}
+
 restResources {
   restApi {
     include '_common', 'indices', 'index', 'search'
diff --git a/x-pack/plugin/analytics/build.gradle b/x-pack/plugin/analytics/build.gradle
index 4318333698e75..fd66cf727e5da 100644
--- a/x-pack/plugin/analytics/build.gradle
+++ b/x-pack/plugin/analytics/build.gradle
@@ -1,3 +1,5 @@
+import org.elasticsearch.gradle.internal.info.BuildParams
+
 apply plugin: 'elasticsearch.internal-es-plugin'
 apply plugin: 'elasticsearch.internal-cluster-test'
 
@@ -17,3 +19,9 @@ dependencies {
   testImplementation(project(":client:rest-high-level"))
 }
 
+if (BuildParams.isSnapshotBuild() == false) {
+  tasks.named("test").configure {
+    systemProperty 'es.index_mode_feature_flag_registered', 'true'
+  }
+}
+
diff --git a/x-pack/plugin/mapper-aggregate-metric/build.gradle b/x-pack/plugin/mapper-aggregate-metric/build.gradle
index 6dfe2d5049ced..0e56638a2f75e 100644
--- a/x-pack/plugin/mapper-aggregate-metric/build.gradle
+++ b/x-pack/plugin/mapper-aggregate-metric/build.gradle
@@ -1,3 +1,5 @@
+import org.elasticsearch.gradle.internal.info.BuildParams
+
 /*
  * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
  * or more contributor license agreements. Licensed under the Elastic License
@@ -23,3 +25,9 @@ dependencies {
   compileOnly project(path: xpackModule('core'))
   testImplementation(testArtifact(project(xpackModule('core'))))
 }
+
+if (BuildParams.isSnapshotBuild() == false) {
+  tasks.named("test").configure {
+    systemProperty 'es.index_mode_feature_flag_registered', 'true'
+  }
+}
diff --git a/x-pack/plugin/mapper-constant-keyword/build.gradle b/x-pack/plugin/mapper-constant-keyword/build.gradle
index 0a9a44f7ca211..034a03a36bd22 100644
--- a/x-pack/plugin/mapper-constant-keyword/build.gradle
+++ b/x-pack/plugin/mapper-constant-keyword/build.gradle
@@ -1,3 +1,5 @@
+import org.elasticsearch.gradle.internal.info.BuildParams
+
 apply plugin: 'elasticsearch.internal-es-plugin'
 apply plugin: 'elasticsearch.internal-cluster-test'
 apply plugin: 'elasticsearch.internal-yaml-rest-test'
@@ -16,3 +18,8 @@ dependencies {
   internalClusterTestImplementation(testArtifact(project(xpackModule('core'))))
 }
 
+if (BuildParams.isSnapshotBuild() == false) {
+  tasks.named("internalClusterTest").configure {
+    systemProperty 'es.index_mode_feature_flag_registered', 'true'
+  }
+}
diff --git a/x-pack/plugin/mapper-unsigned-long/build.gradle b/x-pack/plugin/mapper-unsigned-long/build.gradle
index b21517dd48d83..e301221112f46 100644
--- a/x-pack/plugin/mapper-unsigned-long/build.gradle
+++ b/x-pack/plugin/mapper-unsigned-long/build.gradle
@@ -1,3 +1,5 @@
+import org.elasticsearch.gradle.internal.info.BuildParams
+
 /*
  * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
  * or more contributor license agreements. Licensed under the Elastic License
@@ -40,3 +42,15 @@ tasks.named("yamlRestTestV7CompatTest").configure {
         '50_script_values/script_score query'
     ].join(',')
 }
+
+if (BuildParams.isSnapshotBuild() == false) {
+  tasks.named("test").configure {
+    systemProperty 'es.index_mode_feature_flag_registered', 'true'
+  }
+}
+
+testClusters.configureEach {
+  if (BuildParams.isSnapshotBuild() == false) {
+    systemProperty 'es.index_mode_feature_flag_registered', 'true'
+  }
+}
diff --git a/x-pack/plugin/mapper-version/build.gradle b/x-pack/plugin/mapper-version/build.gradle
index 054acbea8c16f..0558120c95785 100644
--- a/x-pack/plugin/mapper-version/build.gradle
+++ b/x-pack/plugin/mapper-version/build.gradle
@@ -1,3 +1,5 @@
+import org.elasticsearch.gradle.internal.info.BuildParams
+
 evaluationDependsOn(xpackModule('core'))
 
 
@@ -20,3 +22,9 @@ dependencies {
   testImplementation(testArtifact(project(xpackModule('core'))))
   testImplementation project(path: xpackModule('analytics'))
 }
+
+if (BuildParams.isSnapshotBuild() == false) {
+  tasks.named("test").configure {
+    systemProperty 'es.index_mode_feature_flag_registered', 'true'
+  }
+}
diff --git a/x-pack/plugin/spatial/build.gradle b/x-pack/plugin/spatial/build.gradle
index 855677df9a9dc..5c10a7181de2a 100644
--- a/x-pack/plugin/spatial/build.gradle
+++ b/x-pack/plugin/spatial/build.gradle
@@ -1,3 +1,5 @@
+import org.elasticsearch.gradle.internal.info.BuildParams
+
 apply plugin: 'elasticsearch.internal-es-plugin'
 apply plugin: 'elasticsearch.internal-cluster-test'
 
@@ -21,3 +23,9 @@ testClusters.configureEach {
   testDistribution = 'DEFAULT'
   setting 'xpack.security.enabled', 'false'
 }
+
+if (BuildParams.isSnapshotBuild() == false) {
+  tasks.named("test").configure {
+    systemProperty 'es.index_mode_feature_flag_registered', 'true'
+  }
+}
diff --git a/x-pack/plugin/vectors/build.gradle b/x-pack/plugin/vectors/build.gradle
index 477c8da2a2123..c315159567e4e 100644
--- a/x-pack/plugin/vectors/build.gradle
+++ b/x-pack/plugin/vectors/build.gradle
@@ -1,3 +1,5 @@
+import org.elasticsearch.gradle.internal.info.BuildParams
+
 apply plugin: 'elasticsearch.internal-es-plugin'
 apply plugin: 'elasticsearch.internal-cluster-test'
 
@@ -14,3 +16,9 @@ dependencies {
   compileOnly project(path: xpackModule('core'))
   testImplementation(testArtifact(project(xpackModule('core'))))
 }
+
+if (BuildParams.isSnapshotBuild() == false) {
+  tasks.named("test").configure {
+    systemProperty 'es.index_mode_feature_flag_registered', 'true'
+  }
+}
diff --git a/x-pack/plugin/wildcard/build.gradle b/x-pack/plugin/wildcard/build.gradle
index 2c7c1d877d20d..39620245c024e 100644
--- a/x-pack/plugin/wildcard/build.gradle
+++ b/x-pack/plugin/wildcard/build.gradle
@@ -1,3 +1,5 @@
+import org.elasticsearch.gradle.internal.info.BuildParams
+
 apply plugin: 'elasticsearch.internal-es-plugin'
 
 esplugin {
@@ -13,3 +15,8 @@ dependencies {
   testImplementation(testArtifact(project(xpackModule('core'))))
 }
 
+if (BuildParams.isSnapshotBuild() == false) {
+  tasks.named("test").configure {
+    systemProperty 'es.index_mode_feature_flag_registered', 'true'
+  }
+}