Merge pull request #111 from upserve/lower_metadata_cache_size

lowering cache size to prevent out of memory errors

src/main/java/com/upserve/uppend/lookup/LookupMetadata.java

@@ -31,7 +31,7 @@ public class LookupMetadata {
     private static final Logger log = org.slf4j.LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
 
     // TODO make MAX_BISECT_KEY_CACHE_DEPTH configurable via the FileStoreBuilder
-    private static final int MAX_BISECT_KEY_CACHE_DEPTH = 11; // Size == 4_096g
+    private static final int MAX_BISECT_KEY_CACHE_DEPTH = 10; // Size == 2_048
     private static final int MAX_TREE_NODES = treeSize(MAX_BISECT_KEY_CACHE_DEPTH);
     private final LookupKey[] bisectKeys = new LookupKey[MAX_TREE_NODES];