ElasticsearchSecurityException: invalid configuration for xpack.security.transport.ssl - elasticsearch

Question

I'm getting the following error when trying to spin up an elasticsearch cluster in EC2.
org.elasticsearch.ElasticsearchSecurityException: invalid configuration for xpack.security.transport.ssl - [xpack.security.transport.ssl.enabled] is not set, but the following settings have been configured in elasticsearch.yml : [xpack.security.transport.ssl.keystore.secure_password,xpack.security.transport.ssl.truststore.secure_password]
This is the script I'm using to bootstrap the cluster
"#!/bin/bash",
"sudo yum update -y",
"sudo yum install java-1.8.0 -y",
"sudo rpm -i https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-${var.elastic_version}-x86_64.rpm",
"sudo systemctl daemon-reload",
"sudo systemctl enable elasticsearch.service",
"sudo chmod -R 777 /etc/elasticsearch",
"sudo sed -i 's#-Xms1g#-Xms${aws_instance.elastic_datanodes[count.index].root_block_device[0].volume_size / 2}g#g' /etc/elasticsearch/jvm.options",
"sudo sed -i 's#-Xmx1g#-Xmx${aws_instance.elastic_datanodes[count.index].root_block_device[0].volume_size / 2}g#g' /etc/elasticsearch/jvm.options",
# "sudo sed -i 's/#network.host: 192.168.0.1/network.host: 0.0.0.0/g' /etc/elasticsearch/elasticsearch.yml",
"sudo rm /etc/elasticsearch/elasticsearch.yml",
"sudo cp elasticsearch.yml /etc/elasticsearch/elasticsearch.yml",
"sudo systemctl start elasticsearch.service"
This is my elasticsearch yml
# ======================== Elasticsearch Configuration =========================
#
# NOTE: Elasticsearch comes with reasonable defaults for most settings.
# Before you set out to tweak and tune the configuration, make sure you
# understand what are you trying to accomplish and the consequences.
#
# The primary way of configuring a node is via this file. This template lists
# the most important settings you may want to configure for a production cluster.
#
# Please consult the documentation for further information on configuration options:
# https://www.elastic.co/guide/en/elasticsearch/reference/index.html
#
# ---------------------------------- Cluster -----------------------------------
#
# Use a descriptive name for your cluster:
#
cluster.name: ${cluster_name}
#
# ------------------------------------ Node ------------------------------------
#
# Use a descriptive name for the node:
#
node.name: ${node_name}
#
# Add custom attributes to the node:
#
#node.attr.rack: r1
#
# ----------------------------------- Paths ------------------------------------
#
# Path to directory where to store the data (separate multiple locations by comma):
#
path.data: /var/lib/elasticsearch
#
# Path to log files:
#
path.logs: /var/log/elasticsearch
#
# ----------------------------------- Memory -----------------------------------
#
# Lock the memory on startup:
#
#bootstrap.memory_lock: true
#
# Make sure that the heap size is set to about half the memory available
# on the system and that the owner of the process is allowed to use this
# limit.
#
# Elasticsearch performs poorly when the system is swapping the memory.
#
# ---------------------------------- Network -----------------------------------
#
# Set the bind address to a specific IP (IPv4 or IPv6):
#
network.host: ${node}
#
# Set a custom port for HTTP:
#
http.port: 9200
#
# For more information, consult the network module documentation.
#
# --------------------------------- Discovery ----------------------------------
#
# Pass an initial list of hosts to perform discovery when this node is started:
# The default list of hosts is ["127.0.0.1", "[::1]"]
#
discovery.seed_hosts:
%{ for seed_host in seed_hosts ~}
- "${seed_host}"
%{ endfor ~}
#
# Bootstrap the cluster using an initial set of master-eligible nodes:
#
cluster.initial_master_nodes:
%{ for master_node in initial_master_nodes ~}
- "${master_node}"
%{ endfor ~}
node.roles: [data, master]
#
# For more information, consult the discovery and cluster formation module documentation.
#
# ---------------------------------- Gateway -----------------------------------
#
# Block initial recovery after a full cluster restart until N nodes are started:
#
#gateway.recover_after_nodes: 3
#
# For more information, consult the gateway module documentation.
#
# ---------------------------------- Various -----------------------------------
#
# Require explicit names when deleting indices:
#
#action.destructive_requires_name: true
Why is this happening? I can probably get around this by disabling all security settings, but I'd rather not do that for obvious reasons.

Answer 1

Tldr;
I believe you need to set
xpack.security.transport.ssl.enabled: true
In your elasticsearch.yml file.