Logstash Configuration Management API inconsistent with UI

[marcioggs]

Kibana version: 7.0.0

Elasticsearch version: 7.0.0

Server OS version:

NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"

CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"

Browser version:

user-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

Browser OS version:

Distributor ID:	Ubuntu
Description:	Ubuntu 18.04.2 LTS
Release:	18.04
Codename:	bionic

Original install method (e.g. download page, yum, from source, etc.): download page

Describe the bug:
Logstash Configuration Management API accepts adding a pipeline containing @ on it's name, but Kibana UI does not accept this.

Steps to reproduce:

1. Insert a pipeline containing with @ in it's name via API. e.g. pipeline@green
2. Confirm that it was added successfully on Kibana > Management > Logstash > Pipelines.
3. Try to add a pipeline with the same name via Kibana's UI on the same menu mentioned on the last step and clicking on "Create pipeline".
4. Confirm that this message was shown:

Please address the errors in your form.
Pipeline ID must begin with a letter or underscore and contain only letters, underscores, dashes, and numbers

Expected behavior:
That REST API is consistent with UI.

[markov00]

ping @elastic/logstash