add UPGRADING.md

Signed-off-by: channel-dante <dante@channel.io>
opensearch-project · Dec 22, 2023 · 889f789 · 889f789
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+# UPGRADING
+
+## [UPGRADING 2.x to 3.0]
+### SearchAfter of SearchRequest type
+- Changed SearchAfter of SearchRequest type to FieldValue instead of String
+- Consider using `FieldValue.of("")` to make string type values compatible.