Skipping indexer request buffer because index is read only

Hi,

I'm running Production Liferay DXP with ElasticSearch 6.1.4 on AWS. ElasticSearch suddenly enter Index Ready-only mode while we still have 85% of hard disk space available.

Liferay keep showing error:
[19-07-2018 03:33:54 +0000] DEBUG [ajp-apr-8009-exec-72][com.liferay.portal.search.internal.buffer.BufferedIndexerInvocationHandler:76] Skipping indexer request buffer because index is read only'

This is my configuration:
cluster.name: LiferayElasticsearchCluster
network.host: ,localhost
node.name: node1
#bootstrap.memory_lock: true
http.port:
transport.tcp.port:
transport.host:

#################################### Paths ####################################

Path to directory containing configuration (this file and logging.yml):

path.data: /opt/elasticsearch/data/es01-node1

path.logs: /var/log/elasticsearch/es01-node1

action.auto_create_index: false

cluster.routing.allocation.disk.threshold_enabled: false

Thanks in advance!
Visal Man

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