Merge pull request #2629 from edx/derf/terraform

elasticsearch module

terraform/elasticsearch/main.tf

+resource "aws_elasticsearch_domain" "es" {
+    domain_name = "${var.es_domain_name}"
+    advanced_options {
+        "rest.action.multi.allow_explicit_index" = true
+    }
+    cluster_config {
+        instance_type = "${var.es_instance_type}"
+        instance_count = "${var.es_instance_count}"
+        zone_awareness_enabled = true
+    }
+    ebs_options {
+        ebs_enabled = true
+        volume_size = "${var.es_ebs_volume_size}"
+    }
+    access_policies = <<EOF
+{
+    "Version": "2012-10-17",
+    "Statement": [
+        {
+            "Action": "es:*",
+            "Principal": "*",
+            "Effect": "Allow",
+            "Condition": {
+                "IpAddress": {"aws:SourceIp": ["${var.source_ip}"]}
+            }
+        }
+    ]
+}
+EOF
+
+    snapshot_options {
+        automated_snapshot_start_hour = 0 
+    }
+}
+
+output "endpoint" {
+    value = "${endpoint}"
+}

terraform/elasticsearch/variables.tf

+variable "aws_region" {
+	default = "us-east-1"
+}
+variable "es_domain_name" { }
+variable "es_instance_type" {
+  default = "m3.large.elasticsearch"
+}
+variable "es_instance_count" {
+  default = "5"
+}
+variable "es_ebs_volume_size" {
+  default = "100"
+}
+variable "source_ip" { }
+