WIP hardcode the cache size to 48mb

Author: joegallo

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/security/authz/accesscontrol/DocumentSubsetBitsetCache.java

@@ -138,7 +138,7 @@ public DocumentSubsetBitsetCache(Settings settings, ThreadPool threadPool) {
         this.cleanupExecutor = cleanupExecutor;
 
         final TimeValue ttl = CACHE_TTL_SETTING.get(settings);
-        this.maxWeightBytes = CACHE_SIZE_SETTING.get(settings).getBytes();
+        this.maxWeightBytes = ByteSizeValue.ofMb(48).getBytes();
         this.bitsetCache = CacheBuilder.<BitsetCacheKey, BitSet>builder()
             .setExpireAfterAccess(ttl)
             .setMaximumWeight(maxWeightBytes)