java.lang.IllegalArgumentException by percolator plugin

Hi @Andrew_Cholakian1,

I am facing the issue related to percolator plugin while starting elasticsearch service as started working recently on this from other person who left this project. So i am new to this but seeing the error information seems percolator plugin file being used for 6.7.2 and elastic version is 6.6.2.
[2019-07-29T14:31:08,162][ERROR][o.e.b.Bootstrap ] [node-1] Exception
java.lang.IllegalArgumentException: Plugin [percolator] was built for Elasticsearch version 6.7.2 but version 6.6.2 is running
at org.elasticsearch.plugins.PluginsService.verifyCompatibility(PluginsService.java:340) ~[elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.plugins.PluginsService.loadBundle(PluginsService.java:525) ~[elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.plugins.PluginsService.loadBundles(PluginsService.java:465) ~[elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.plugins.PluginsService.(PluginsService.java:157) ~[elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.node.Node.(Node.java:337) ~[elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.node.Node.(Node.java:265) ~[elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.bootstrap.Bootstrap$5.(Bootstrap.java:212) ~[elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:212) ~[elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:333) [elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:159) [elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:150) [elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) [elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) [elasticsearch-cli-6.6.2.jar:6.6.2]
at org.elasticsearch.cli.Command.main(Command.java:90) [elasticsearch-cli-6.6.2.jar:6.6.2]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:116) [elasticsearch-6.6.2.jar:6.6.2]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:93) [elasticsearch-6.6.2.jar:6.6.2]