[docs] s/lags/Flags/

Copy and paste lots an `F`.

docs/reference/analysis/analyzers/pattern-analyzer.asciidoc

@@ -148,7 +148,7 @@ The `pattern` analyzer accepts the following parameters:
 `flags`::
 
     Java regular expression http://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html#field.summary[flags].
-    lags should be pipe-separated, eg `"CASE_INSENSITIVE|COMMENTS"`.
+    Flags should be pipe-separated, eg `"CASE_INSENSITIVE|COMMENTS"`.
 
 `lowercase`::
 

docs/reference/analysis/charfilters/pattern-replace-charfilter.asciidoc

@@ -24,7 +24,7 @@ The `pattern_replace` character filter accepts the following parameters:
 `flags`::
 
     Java regular expression http://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html#field.summary[flags].
-    lags should be pipe-separated, eg `"CASE_INSENSITIVE|COMMENTS"`.
+    Flags should be pipe-separated, eg `"CASE_INSENSITIVE|COMMENTS"`.
 
 [float]
 === Example configuration