How to change Elasticsearch max memory size

Question

I have an Apache server with a default configuration of Elasticsearch and everything works perfectly, except that the default configuration has a max size of 1GB.

I

Answer 1

• Elasticsearch will assign the entire heap specified in jvm.options via the Xms (minimum heap size) and Xmx (maximum heap size) settings.
  • -Xmx12g
  • -Xmx12g
• Set the minimum heap size (Xms) and maximum heap size (Xmx) to be equal to each other.

• Don’t set Xmx to above the cutoff that the JVM uses for compressed object pointers (compressed oops), the exact cutoff varies but is near 32 GB.

• It is also possible to set the heap size via an environment variable

  • ES_JAVA_OPTS="-Xms2g -Xmx2g" ./bin/elasticsearch
  • ES_JAVA_OPTS="-Xms4000m -Xmx4000m" ./bin/elasticsearch