logs_index: specify 1 filter block (#1247)

* `logs_index`: specify 1 `filter` block

* make docs

Author: bendrucker

datadog/resource_datadog_logs_index.go

@@ -50,6 +50,7 @@ var indexSchema = map[string]*schema.Schema{
 		Description: "Logs filter",
 		Type:        schema.TypeList,
 		Required:    true,
+		MaxItems:    1,
 		Elem: &schema.Resource{
 			Schema: map[string]*schema.Schema{
 				"query": {

docs/resources/logs_index.md

@@ -47,7 +47,7 @@ resource "datadog_logs_index" "sample_index" {
 
 ### Required
 
-- **filter** (Block List, Min: 1) Logs filter (see [below for nested schema](#nestedblock--filter))
+- **filter** (Block List, Min: 1, Max: 1) Logs filter (see [below for nested schema](#nestedblock--filter))
 - **name** (String) The name of the index.
 
 ### Optional