Remove beta marker from the synonym_graph docs
[[analysis-synonym-graph-tokenfilter]]
=== Synonym Graph Token Filter
-beta[]
-
The `synonym_graph` token filter allows to easily handle synonyms,
including multi-word synonyms correctly during the analysis process.
@@ -187,3 +185,8 @@ multiple versions of a token may choose which version of the token to emit when
parsing synonyms, e.g. `asciifolding` will only produce the folded version of the
token. Others, e.g. `multiplexer`, `word_delimiter_graph` or `ngram` will throw an
error.
+
+WARNING:The synonym rules should not contain words that are removed by
+a filter that appears after in the chain (a `stop` filter for instance).
+Removing a term from a synonym rule breaks the matching at query time.
+
