add elastic8 filer store for Elasticsearch 8 (#9916)

* elastic: fix listing against a missing or empty directory index

The refresh 404 leaked into the named return, so the first listing of a
directory whose index does not exist yet returned an error instead of an
empty result. Sorting also fails on an index with no documents
("No mapping found for [_id] in order to sort on"); unmapped_type
keeps the resumed-listing path working there.

* add elastic8 filer store for Elasticsearch 8

Elasticsearch 8 disables _id fielddata by default, so the elastic7
store's directory listings fail with "Fielddata access on the _id
field is disallowed". elastic8 uses the same client and configuration
options, but also indexes the document id as an Id field and sorts
listings on Id.keyword.

weed/command/scaffold/filer.toml

@@ -366,6 +366,21 @@ healthcheck_enabled = false
 # increase the value is recommend, be sure the value in Elastic is greater or equal here
 index.max_result_window = 10000
 
+# for Elasticsearch 8.x clusters
+[elastic8]
+enabled = false
+servers = [
+    "http://localhost1:9200",
+    "http://localhost2:9200",
+    "http://localhost3:9200",
+]
+username = ""
+password = ""
+sniff_enabled = false
+healthcheck_enabled = false
+# increase the value is recommend, be sure the value in Elastic is greater or equal here
+index.max_result_window = 10000
+
 
 [arangodb] # in development dont use it
 enabled = false