elasticsearch_domain.tf

#
# Elasticsearch Domain
#

resource "aws_elasticsearch_domain_policy" "default" {
  count           = local.elasticsearch_enabled && (length(var.iam_authorizing_role_arns) > 0 || length(var.iam_role_arns) > 0) ? 1 : 0
  domain_name     = module.this.id
  access_policies = join("", data.aws_iam_policy_document.default[*].json)
}

resource "aws_elasticsearch_domain" "default" {
  count                 = local.elasticsearch_enabled ? 1 : 0
  domain_name           = module.this.id
  elasticsearch_version = var.elasticsearch_version

  advanced_options = var.advanced_options

  advanced_security_options {
    enabled                        = var.advanced_security_options_enabled
    internal_user_database_enabled = var.advanced_security_options_internal_user_database_enabled
    master_user_options {
      master_user_arn      = var.advanced_security_options_master_user_arn
      master_user_name     = var.advanced_security_options_master_user_name
      master_user_password = var.advanced_security_options_master_user_password
    }
  }

  ebs_options {
    ebs_enabled = var.ebs_volume_size > 0 ? true : false
    volume_size = var.ebs_volume_size
    volume_type = var.ebs_volume_type
    iops        = var.ebs_iops
    throughput  = var.ebs_throughput
  }

  encrypt_at_rest {
    enabled    = var.encrypt_at_rest_enabled
    kms_key_id = var.encrypt_at_rest_kms_key_id
  }

  domain_endpoint_options {
    enforce_https                   = var.domain_endpoint_options_enforce_https
    tls_security_policy             = var.domain_endpoint_options_tls_security_policy
    custom_endpoint_enabled         = var.custom_endpoint_enabled
    custom_endpoint                 = var.custom_endpoint_enabled ? var.custom_endpoint : null
    custom_endpoint_certificate_arn = var.custom_endpoint_enabled ? var.custom_endpoint_certificate_arn : null
  }

  cluster_config {
    instance_count           = var.instance_count
    instance_type            = var.instance_type
    dedicated_master_enabled = var.dedicated_master_enabled
    dedicated_master_count   = var.dedicated_master_enabled ? var.dedicated_master_count : null
    dedicated_master_type    = var.dedicated_master_enabled ? var.dedicated_master_type : null
    zone_awareness_enabled   = var.zone_awareness_enabled
    warm_enabled             = var.warm_enabled
    warm_count               = var.warm_enabled ? var.warm_count : null
    warm_type                = var.warm_enabled ? var.warm_type : null

    dynamic "zone_awareness_config" {
      for_each = var.availability_zone_count > 1 && var.zone_awareness_enabled ? [true] : []
      content {
        availability_zone_count = var.availability_zone_count
      }
    }

    dynamic "cold_storage_options" {
      for_each = var.cold_storage_enabled ? [true] : []
      content {
        enabled = var.cold_storage_enabled
      }
    }
  }

  dynamic "auto_tune_options" {
    for_each = var.auto_tune.enabled ? [true] : []
    content {
      desired_state       = "ENABLED"
      rollback_on_disable = var.auto_tune.rollback_on_disable
      maintenance_schedule {
        # Required until https://github.com/hashicorp/terraform-provider-aws/issues/22239 would be resolved
        start_at = var.auto_tune.starting_time == null ? timeadd(timestamp(), "1h") : var.auto_tune.starting_time
        duration {
          value = var.auto_tune.duration
          unit  = "HOURS"
        }
        cron_expression_for_recurrence = var.auto_tune.cron_schedule
      }
    }
  }

  node_to_node_encryption {
    enabled = var.node_to_node_encryption_enabled
  }

  dynamic "vpc_options" {
    for_each = var.vpc_enabled ? [true] : []

    content {
      security_group_ids = var.create_security_group ? [join("", aws_security_group.default[*].id)] : var.security_groups
      subnet_ids         = var.subnet_ids
    }
  }

  snapshot_options {
    automated_snapshot_start_hour = var.automated_snapshot_start_hour
  }

  dynamic "cognito_options" {
    for_each = var.cognito_authentication_enabled ? [true] : []
    content {
      enabled          = true
      user_pool_id     = var.cognito_user_pool_id
      identity_pool_id = var.cognito_identity_pool_id
      role_arn         = var.cognito_iam_role_arn
    }
  }

  log_publishing_options {
    enabled                  = var.log_publishing_index_enabled
    log_type                 = "INDEX_SLOW_LOGS"
    cloudwatch_log_group_arn = var.log_publishing_index_cloudwatch_log_group_arn
  }

  log_publishing_options {
    enabled                  = var.log_publishing_search_enabled
    log_type                 = "SEARCH_SLOW_LOGS"
    cloudwatch_log_group_arn = var.log_publishing_search_cloudwatch_log_group_arn
  }

  log_publishing_options {
    enabled                  = var.log_publishing_audit_enabled
    log_type                 = "AUDIT_LOGS"
    cloudwatch_log_group_arn = var.log_publishing_audit_cloudwatch_log_group_arn
  }

  log_publishing_options {
    enabled                  = var.log_publishing_application_enabled
    log_type                 = "ES_APPLICATION_LOGS"
    cloudwatch_log_group_arn = var.log_publishing_application_cloudwatch_log_group_arn
  }

  tags = module.this.tags

  depends_on = [aws_iam_service_linked_role.default]
}