# Error in 5.0.0-alpha5 **URL:** \ **Category:** Elasticsearch\ **Created:** [September 16, 2016, 3:16pm UTC](https://discuss.elastic.co/t/error-in-5-0-0-alpha5/60729 "2016-09-16T15:16:19Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Bradly](https://avatars.discourse-cdn.com/v4/letter/b/90ced4/32.png) [@Bradly](https://discuss.elastic.co/u/Bradly)\ **Post date:** [September 16, 2016, 3:16pm UTC](https://discuss.elastic.co/t/error-in-5-0-0-alpha5/60729/1 "2016-09-16T15:16:19Z")
I have a elasticsearch cluster here at my office that I have been using to do various things trying to learn more about it. I decided I wanted to upgrade to the new version. At any rate now elasticsearch wont start. It throws the below error. Any help would be greatly appreciated. [2016-09-16 10:08:12,537][INFO][plugins] [Elasticsearch-Alpha] loaded module [aggs-matrix-stats] [2016-09-16 10:08:12,537][INFO][plugins] [Elasticsearch-Alpha] loaded module [ingest-common] [2016-09-16 10:08:12,538][INFO][plugins] [Elasticsearch-Alpha] loaded module [lang-expression] [2016-09-16 10:08:12,538][INFO][plugins] [Elasticsearch-Alpha] loaded module [lang-groovy] [2016-09-16 10:08:12,538][INFO][plugins] [Elasticsearch-Alpha] loaded module [lang-mustache] [2016-09-16 10:08:12,538][INFO][plugins] [Elasticsearch-Alpha] loaded module [lang-painless] [2016-09-16 10:08:12,538][INFO][plugins] [Elasticsearch-Alpha] loaded module [percolator] [2016-09-16 10:08:12,538][INFO][plugins] [Elasticsearch-Alpha] loaded module [reindex] [2016-09-16 10:08:12,538][INFO][plugins] [Elasticsearch-Alpha] loaded module [transport-netty3] [2016-09-16 10:08:12,538][INFO][plugins] [Elasticsearch-Alpha] loaded module [transport-netty4] [2016-09-16 10:08:12,539][INFO][plugins] [Elasticsearch-Alpha] no plugins loaded [2016-09-16 10:08:13,828][ERROR][bootstrap] Exception java.lang.IllegalArgumentException: unknown setting [bootstrap.mlockall] please check that any required plugins are installed, or check the breaking changes documentation for removed settings at org.elasticsearch.common.settings.AbstractScopedSettings.validate(AbstractScopedSettings.java:270) at org.elasticsearch.common.settings.AbstractScopedSettings.validate(AbstractScopedSettings.java:238) at org.elasticsearch.common.settings.SettingsModule.(SettingsModule.java:138) at org.elasticsearch.node.Node.(Node.java:298) at org.elasticsearch.node.Node.(Node.java:206) at org.elasticsearch.bootstrap.Bootstrap$5.(Bootstrap.java:175) at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:175) at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:255) at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:101) at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:96) at org.elasticsearch.cli.SettingCommand.execute(SettingCommand.java:54) at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:88) at org.elasticsearch.cli.Command.main(Command.java:54) at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:75) at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:68) [2016-09-16 10:08:13,833][WARN][bootstrap] [Elasticsearch-Alpha] uncaught exception in thread [main] org.elasticsearch.bootstrap.StartupError: java.lang.IllegalArgumentException: unknown setting [bootstrap.mlockall] please check that any required plugins are installed, or check the breaking changes documentation for removed settings at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:105) at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:96) at org.elasticsearch.cli.SettingCommand.execute(SettingCommand.java:54) at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:88) at org.elasticsearch.cli.Command.main(Command.java:54) at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:75) at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:68) Caused by: java.lang.IllegalArgumentException: unknown setting [bootstrap.mlockall] please check that any required plugins are installed, or check the breaking changes documentation for removed settings at org.elasticsearch.common.settings.AbstractScopedSettings.validate(AbstractScopedSettings.java:270) at org.elasticsearch.common.settings.AbstractScopedSettings.validate(AbstractScopedSettings.java:238) at org.elasticsearch.common.settings.SettingsModule.(SettingsModule.java:138) at org.elasticsearch.node.Node.(Node.java:298) at org.elasticsearch.node.Node.(Node.java:206) at org.elasticsearch.bootstrap.Bootstrap$5.(Bootstrap.java:175) at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:175) at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:255) at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:101) ... 6 more ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [September 16, 2016, 3:27pm UTC](https://discuss.elastic.co/t/error-in-5-0-0-alpha5/60729/2 "2016-09-16T15:27:29Z")
Please format your code using `` icon. It will make your post more readable. `bootstrap.mlockall` is not an available setting anymore. Check the breaking changes for 5.0. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 5, 2017, 10:19pm UTC](https://discuss.elastic.co/t/error-in-5-0-0-alpha5/60729/3 "2017-07-05T22:19:34Z")