[DOCS] Remove unneeded ifdef::asciidoctor[] conditionals (#42758)

    Several `ifdef::asciidoctor` conditionals were added so that AsciiDoc
    and Asciidoctor doc builds rendered consistently.

    With elastic/docs#827, Elasticsearch Reference
    documentation migrated completely to Asciidoctor. We no longer need to
    support AsciiDoc so we can remove these conditionals.

    Resolves #41722

docs/reference/security/securing-communications/configuring-tls-docker.asciidoc

@@ -62,7 +62,6 @@ endif::[]
 
 ifeval::["{release-state}"!="unreleased"]
 
-ifdef::asciidoctor[]
 ["source","yaml",subs="attributes"]
 ----
 version: '2.2'
@@ -86,32 +85,6 @@ services:
     working_dir: /usr/share/elasticsearch
     volumes: ['.:/usr/share/elasticsearch/config/certificates']
 ----
-endif::[]
-ifndef::asciidoctor[]
-["source","yaml",subs="attributes"]
-----
-version: '2.2'
-
-services:
-  create_certs:
-    container_name: create_certs
-    image: {docker-image}
-    command: >
-      bash -c '
-        if [[ ! -d config/certificates/certs ]]; then
-          mkdir config/certificates/certs;
-        fi;
-        if [[ ! -f /local/certs/bundle.zip ]]; then
-          bin/elasticsearch-certgen --silent --in config/certificates/instances.yml --out config/certificates/certs/bundle.zip;
-          unzip config/certificates/certs/bundle.zip -d config/certificates/certs; <1>
-        fi;
-        chgrp -R 0 config/certificates/certs
-      '
-    user: $\{UID:-1000\}
-    working_dir: /usr/share/elasticsearch
-    volumes: ['.:/usr/share/elasticsearch/config/certificates']
-----
-endif::[]
 
 <1> The new node certificates and CA certificate+key are placed under the local directory `certs`.
 endif::[]