• add deprecation notice to docs #1993 - codec removed in 1.5
• FIX for the required gems when USE_JRUBY=1 https://logstash.jira.com/browse/LOGSTASH-1918 1.4.x #1099 - already fixed in Add missing 'rack' gem #1164
• Use jruby to run 'make test' #1232 - makefile is dead
• Download contrib plugins tarball file only it's necessary. #1234 - obsolete with 1.5
• Better bash test for file download fault. #1245 - obsolete with 1.5
• Fix http error message by using the correct body variable #1027 - obsolete with 1.5
• Add configurable interval between command runs. #1845 - superseed by Allow to configure pipe restart behaviour logstash-plugins/logstash-input-pipe#1
• broken link to mongodb at page "Extending logstash" ( #1265 ) #1266 - replaced by [DOC] Correct links to plugin sources #2164
• Fixing expansion of ELASTICSEARCH_VERSION variable in Getting Started tutorial #1457 - already fixed

and some obsolete/duplicate issues

• doc: broken link to mongodb at page "Extending logstash" #1265 - issue related to broken link to mongodb at page "Extending logstash" ( #1265 ) #1266, covered by [DOC] Correct links to plugin sources #2164
• discrepency between grok pattern TIMESTAMP_ISO8601 and ISO8601 in date filter #1464 - fixed in 1.5.0 by Support almost-ISO8601 patterns in date filter ISO8601 config #769
• tag_on_failure for the date filter #1615 - covered by Fallback to en locale + better failure logging and tag_on_failure logstash-plugins/logstash-filter-date#2
• No help-text for the -t, --configtest flags when running with -h, or --help #1502 - fixed by [JIRA-2046][JIRA-2181] fix usage help #1354
• Couldn't find any output plugin named 'stdoutdout' #1602 - inactive question
• Minimal package installation? #1659 - inactive question
• Upgrade to GeoIP2? #1662 - duplicate of GeoLite2 support #1709
• win32ole failing #1733 - answered
• Link to docs is broken. #2057 - covered by [DOC] Correct links to plugin sources #2164
• Change database redis to cassandra #1917 - answered
• --watchdog-timeout is not works #1862 - anwered in googlegroups