Adding note about outputs/elasticsearch/index requiring lowercase letters

ElasticSearch will refuse to create (without an error) any indexes that contain uppercase letters. Lowercase letters, numbers, and punctuation are permitted.
Fixed region_endpoint bad check
Update docs to point to the new, elasticsearch-hosted download
Update logstash.sysv.redhat

Move daemon startup to be much later to allow for network file-systems to be mounted before we start.
Fix a few typos and make docs a bit more readable.
- remove some unused stuff
adding sumnumbers filter
inputs: pipe: rerun command when it terminates

This change causes the pipe input to keep rerunning the command.
Without this change, if the command crashes or simply stops sending
output for some unknown reason, then logging effectively stops.  Also,
it introduces a short delay before restarting the command to avoid
churning on a failing command.
Use 4560 (log4j default) as default port
Begin converting literal named captures to Grok expressions.
Finished removing literal named captures from Cisco ASA Grok patterns
Fix SINCEDB_DIR environment variable name
digest/sha2 was required for sqs to connect successfully
Added initial version of collectd input plugin.
Removed unnecessary default codec.
- raise an exception if you try to set @timestamp to an invalid value
type. OH STATIC TYPING SOMETIMES I MISS YOU.
Updated several areas to address the concerns expressed.  Please see the diffs for more info.
Fixed indents on collectd config sample.
Fixed required (was missing ‘d’)
[oldlogstashjson] add tests before making changes
[oldlogstashjson] encode to json instead of ruby hash (LOGSTASH-1626)