Fix bug with -i option

[AlexRuiz7]

Related issue
#2583

Description

This PR fixes a small bug when using the -i option of the indexer-ism-init.sh script.

It also adds the possibility of using a custom value for the policy.

Logs example

bash indexer-ism-init.sh -a 30d -d 1000 -i 192.168.56.10 -s 5 -p SecretPassword -P 1
Parameters:
  -a|--min-index-age: 30d
  -d|--min-doc-count: 1000
  -i|--indexer-hostname: 192.168.56.10
  -p|--indexer-password: SecretPassword
  -P|--priority: 1
  -s|--min-shard-size: 5

Global variable:
  - INDEXER_URL: https://192.168.56.10:9200/
  - C_AUTH: -u admin:SecretPassword

Constants:
  - POLICY_NAME: rollover_policy
  - ISM_INDEX_PATTERNS: ["wazuh-alerts-*", "wazuh-archives-*", "-wazuh-alerts-4.x-sample*"]

bash indexer-ism-init.sh                                                            
Parameters:
  -a|--min-index-age: 7d
  -d|--min-doc-count: 200000000
  -i|--indexer-hostname: localhost
  -p|--indexer-password: admin
  -P|--priority: 50
  -s|--min-shard-size: 25

Global variable:
  - INDEXER_URL: https://localhost:9200
  - C_AUTH: -u admin:admin

Constants:
  - POLICY_NAME: rollover_policy
  - ISM_INDEX_PATTERNS: ["wazuh-alerts-*", "wazuh-archives-*", "-wazuh-alerts-4.x-sample*"]

Tests

• Build the package in any supported platform
  • Linux
  • Windows
  • macOS
  • Solaris
  • AIX
  • HP-UX
• Package installation
• Package upgrade
• Package downgrade
• Package remove
• Package install/remove/install
• Change added to CHANGELOG.md

• Tests for Linux RPM
  • Build the package for x86_64
  • Build the package for i386
  • Build the package for armhf
  • Build the package for aarch64
  • %files section is correctly updated if necessary
• Tests for Linux deb
  • Build the package for x86_64
  • Build the package for i386
  • Build the package for armhf
  • Build the package for aarch64
  • Package install/remove/install
  • Package install/purge/install
  • Check file permissions after installing the package
• Tests for macOS
  • Test the package from macOS Sierra to Mojave
• Tests for Solaris
  • Test the package on Solaris 10
  • Test the package on Solaris 11
  • Check file permissions on Solaris 11 template
• Tests for IBM AIX
  • %files section is correctly updated if necessary
  • Check the changes from IBM AIX 5 to 7