MINOR: sample: add the sha1 converter
This converter can be used to generate a SHA1 digest from binary type
sample. The result is a binary sample with length of 20 bytes.
diff --git a/doc/configuration.txt b/doc/configuration.txt
index ed3f3f6..818931e 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -12912,6 +12912,10 @@
This prefix is followed by a name. The separator is a '.'. The name may only
contain characters 'a-z', 'A-Z', '0-9', '.' and '_'.
+sha1
+ Converts a binary input sample to a SHA1 digest. The result is a binary
+ sample with length of 20 bytes.
+
sub(<value>)
Subtracts <value> from the input value of type signed integer, and returns
the result as an signed integer. Note: in order to subtract the input from