feat: index pattern submodule

modules/dashboard/index-pattern/README.md

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+## Requirements
+
+| Name | Version |
+|------|---------|
+| <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 1.4 |
+| <a name="requirement_opensearch"></a> [opensearch](#requirement\_opensearch) | >= 1.0 |
+
+## Providers
+
+| Name | Version |
+|------|---------|
+| <a name="provider_opensearch"></a> [opensearch](#provider\_opensearch) | >= 1.0 |
+
+## Modules
+
+No modules.
+
+## Resources
+
+| Name | Type |
+|------|------|
+| [opensearch_dashboard_object.index_pattern](https://registry.terraform.io/providers/opensearch-project/opensearch/latest/docs/resources/dashboard_object) | resource |
+
+## Inputs
+
+| Name | Description | Type | Default | Required |
+|------|-------------|------|---------|:--------:|
+| <a name="input_pattern"></a> [pattern](#input\_pattern) | The index pattern | `string` | n/a | yes |
+| <a name="input_pattern_id"></a> [pattern\_id](#input\_pattern\_id) | The ID of index pattern | `string` | `null` | no |
+| <a name="input_time_field_name"></a> [time\_field\_name](#input\_time\_field\_name) | Field name which has the timestamp | `string` | n/a | yes |
+
+## Outputs
+
+| Name | Description |
+|------|-------------|
+| <a name="output_id"></a> [id](#output\_id) | The ID of the index pattern |

modules/dashboard/index-pattern/main.tf

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+locals {
+  id = coalesce(var.pattern_id, split("-*", var.pattern)[0])
+}
+
+resource "opensearch_dashboard_object" "index_pattern" {
+  body = <<EOF
+[
+  {
+    "_id": "index-pattern:${local.id}",
+    "_type": "doc",
+    "_source": {
+      "type": "index-pattern",
+      "index-pattern": {
+        "title": "${var.pattern}",
+        "timeFieldName": "${var.time_field_name}"
+      }
+    }
+  }
+]
+EOF
+}

modules/dashboard/index-pattern/outputs.tf

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+output "id" {
+  description = "The ID of the index pattern"
+  value       = opensearch_dashboard_object.index_pattern.id
+}

modules/dashboard/index-pattern/variables.tf

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+variable "pattern" {
+  description = "The index pattern"
+  type        = string
+}
+
+variable "pattern_id" {
+  description = "The ID of index pattern"
+  type        = string
+  default     = null
+}
+
+variable "time_field_name" {
+  description = "Field name which has the timestamp"
+  type        = string
+}

modules/dashboard/index-pattern/versions.tf

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+terraform {
+  required_version = ">= 1.4"
+
+  required_providers {
+    opensearch = {
+      source  = "opensearch-project/opensearch"
+      version = ">= 1.0"
+    }
+  }
+}