Feature/tiered caching

.gitignore

@@ -64,4 +64,5 @@ testfixtures_shared/
 .ci/jobs/
 
 # build files generated
-doc-tools/missing-doclet/bin/
+doc-tools/missing-doclet/bin/
+server/src/main/java/org/opensearch/indices/KLSPerformanceTest.java

distribution/src/config/opensearch.yml

@@ -127,3 +127,7 @@ ${path.logs}
 # Once there is no observed impact on performance, this feature flag can be removed.
 #
 #opensearch.experimental.optimization.datetime_formatter_caching.enabled: false
+#
+#
+# Gates the tiered caching feature. This feature adds a disk tier to the IndicesRequestCache.
+# opensearch.experimental.feature.tiered_caching.enabled: false

server/build.gradle

@@ -161,6 +161,9 @@ dependencies {
   api "org.ehcache:ehcache:${versions.ehcache}"
   api "org.slf4j:slf4j-api:${versions.slf4j}"
 
+  // roaring bitmaps
+  api 'org.roaringbitmap:RoaringBitmap:0.9.49'
+  runtimeOnly 'org.roaringbitmap:shims:0.9.49'
 
   testImplementation(project(":test:framework")) {
     // tests use the locally compiled version of server

server/licenses/RoaringBitmap-0.9.49.jar.sha1

@@ -0,0 +1 @@
+b45b49c1ec5c5fc48580412d0ca635e1833110ea

server/licenses/RoaringBitmap-LICENSE.txt

@@ -0,0 +1,191 @@
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+http://www.apache.org/licenses/
+
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server/licenses/shims-0.9.49.jar.sha1

@@ -0,0 +1 @@
+8bd7794fbdaa9536354dd2d8d961d9503beb9460