In ElasticSearch >= 5 the documentation has changed, which means none of the above answers worked for me.
I tried changing
/etc/default/elasticsearch and in
etc/init.d/elasticsearch, but when I ran
ps aux | grep elasticsearch the output still showed:
/usr/bin/java -Xms2g -Xmx2g # aka 2G min and max ram
I had to make these changes in:
# Xms represents the initial size of total heap space # Xmx represents the maximum size of total heap space -Xms1g -Xmx1g # the settings shipped with ES 5 were: -Xms2g # the settings shipped with ES 5 were: -Xmx2g