Remove version tags and add notes for schema changes

Signed-off-by: hye-on <[email protected]>

Author: hye-on

spec/schemas/nodes.info.yaml

@@ -66,17 +66,15 @@ components:
             $ref: '#/components/schemas/NodeThreadPoolInfo'
         total_indexing_buffer:
           description: Total heap allowed to be used to hold recently indexed documents before they must be written to disk. This size is a shared pool across all shards on this node, and is controlled by Indexing Buffer settings.
+          # NOTE: In OpenSearch 3.0, this field will change from ByteCount to HumanReadableByteCount
           oneOf:
             - $ref: '_common.yaml#/components/schemas/ByteCount'
-              x-version-removed: '3.0'
             - $ref: '_common.yaml#/components/schemas/HumanReadableByteCount'
-              x-version-added: '3.0'
         total_indexing_buffer_in_bytes:
+          # NOTE: In OpenSearch 3.0, this field will change from HumanReadableByteCount to ByteCount
           oneOf:
             - $ref: '_common.yaml#/components/schemas/HumanReadableByteCount'
-              x-version-removed: '3.0'
             - $ref: '_common.yaml#/components/schemas/ByteCount'
-              x-version-added: '3.0'
         transport:
           $ref: '#/components/schemas/NodeInfoTransport'
         transport_address: