The Elasticsearch configuration settings have changed with each major release; the following matrix shows how they changed by version.

The "×" cells indicate that the setting is no longer used.

Elasticsearch Settings

Location: /etc/elasticsearch/elasticsearch.yml

Elasticsearch 2.3.3	5.6.12	6.8.6	7.5.2

Elasticsearch 2.3.3	5.6.12	6.8.6	7.5.2
index.max_result_window	×	×	×
index.translog.sync_interval	×	×	×
index.translog.durability	×	×	×
bootstrap.mlockall	bootstrap.memory_lock
threadpool.bulk.queue_size		thread_pool.write.queue_size
script.inline script.indexed	script.inline	×	×
discovery.zen.ping.unicast.hosts			discovery.seed_hosts
discovery.zen.minimum_master_nodes			cluster.initial_master_nodes

Memory Management

Location	Setting	Elasticsearch 2.3.3	5.6.12	6.8.6	7.5.2

Location

Setting

Elasticsearch 2.3.3

5.6.12

6.8.6

7.5.2

/etc/sysconfig/elasticsearch

ES_HEAP_SIZE

Set to half the physical memory on the
machine, but not more than 31 GB.

×

/etc/elasticsearch/jvm.options

-Xms

-Xmx

×

Set to half the available memory,
but not more than 31 GB.