Use new bulk API endpoint in the docs (#37698)

This change switches to using the typeless bulk API endpoint in the
documentation snippets where possible

docs/reference/aggregations/bucket/adjacency-matrix-aggregation.asciidoc

@@ -30,7 +30,7 @@ Example:
 
 [source,js]
 --------------------------------------------------
-PUT /emails/_doc/_bulk?refresh
+PUT /emails/_bulk?refresh
 { "index" : { "_id" : 1 } }
 { "accounts" : ["hillary", "sidney"]}
 { "index" : { "_id" : 2 } }

docs/reference/aggregations/bucket/filters-aggregation.asciidoc

@@ -9,7 +9,7 @@ Example:
 
 [source,js]
 --------------------------------------------------
-PUT /logs/_doc/_bulk?refresh
+PUT /logs/_bulk?refresh
 { "index" : { "_id" : 1 } }
 { "body" : "warning: page could not be rendered" }
 { "index" : { "_id" : 2 } }

docs/reference/aggregations/metrics/scripted-metric-aggregation.asciidoc

@@ -147,7 +147,7 @@ Imagine a situation where you index the following documents into an index with 2
 
 [source,js]
 --------------------------------------------------
-PUT /transactions/_doc/_bulk?refresh
+PUT /transactions/_bulk?refresh
 {"index":{"_id":1}}
 {"type": "sale","amount": 80}
 {"index":{"_id":2}}

docs/reference/getting-started.asciidoc

@@ -633,7 +633,7 @@ As a quick example, the following call indexes two documents (ID 1 - John Doe an
 
 [source,js]
 --------------------------------------------------
-POST /customer/_doc/_bulk?pretty
+POST /customer/_bulk?pretty
 {"index":{"_id":"1"}}
 {"name": "John Doe" }
 {"index":{"_id":"2"}}
@@ -645,7 +645,7 @@ This example updates the first document (ID of 1) and then deletes the second do
 
 [source,sh]
 --------------------------------------------------
-POST /customer/_doc/_bulk?pretty
+POST /customer/_bulk?pretty
 {"update":{"_id":"1"}}
 {"doc": { "name": "John Doe becomes Jane Doe" } }
 {"delete":{"_id":"2"}}
@@ -692,7 +692,7 @@ You can download the sample dataset (accounts.json) from https://github.com/elas
 
 [source,sh]
 --------------------------------------------------
-curl -H "Content-Type: application/json" -XPOST "localhost:9200/bank/_doc/_bulk?pretty&refresh" --data-binary "@accounts.json"
+curl -H "Content-Type: application/json" -XPOST "localhost:9200/bank/_bulk?pretty&refresh" --data-binary "@accounts.json"
 curl "localhost:9200/_cat/indices?v"
 --------------------------------------------------
 // NOTCONSOLE

docs/reference/search/validate.asciidoc

@@ -6,7 +6,7 @@ without executing it. We'll use the following test data to explain _validate:
 
 [source,js]
 --------------------------------------------------
-PUT twitter/_doc/_bulk?refresh
+PUT twitter/_bulk?refresh
 {"index":{"_id":1}}
 {"user" : "kimchy", "post_date" : "2009-11-15T14:12:12", "message" : "trying out Elasticsearch"}
 {"index":{"_id":2}}