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

libs/core/src/main/java/org/opensearch/core/common/bytes/BytesReference.java

@@ -45,6 +45,7 @@
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.OutputStream;
+import java.io.Serializable;
 import java.nio.ByteBuffer;
 import java.util.ArrayList;
 

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 @@
+Apache License
+Version 2.0, January 2004
+http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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server/licenses/shims-0.9.49.jar.sha1

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