Elastic search error operation [search] and lang [groovy] is disabled?
Add script.engine.groovy.inline.search: on to elasticsearch.yml configuration file and restart the node.
adding script.groovy.sandbox.enabled: true to .yml works for me
For ES Version 2.x+
script.inline: onscript.indexed: on
Add script.engine.groovy.inline.aggs: onscript.engine.groovy.inline.update: on to elasticsearch.ymland restart