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added breaking docs

Martijn van Groningen 10 年之前
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      docs/reference/migration/migrate_2_0.asciidoc

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docs/reference/migration/migrate_2_0.asciidoc

@@ -770,3 +770,8 @@ For the record, official plugins which can use this new simplified form are:
 * elasticsearch-lang-javascript
 * elasticsearch-lang-python
 
+=== Aliases
+
+Fields used in alias filters no longer have to exist in the mapping upon alias creation time. Alias filters are now
+parsed at request time and then the fields in filters are resolved from the mapping, whereas before alias filters were
+parsed at alias creation time and the parsed form was kept around in memory.