+ /**
+ * Applies write/remove diff operation for each modification child in modification subtree.
+ * Operation also sets the Data tree references for each Tree Node (Index Node) in meta (MutableTreeNode) structure.
+ *
+ * @param meta MutableTreeNode (IndexTreeNode)
+ * @param data DataBuilder
+ * @param nodeVersion Version of TreeNode
+ * @param modifications modification operations to apply
+ * @return Sealed immutable copy of TreeNode structure with all Data Node references set.
+ */