Ansible find only files which have changed - ansible-2.x

Question

I'm trying to look for a pattern in Postgres configuration files, and
only wants to find changed files that match the search pattern.
---
- name: Query postgres pattern matched files
hosts: pghosts
gather_facts: false
tasks:
- name: "Find postgres conf files"
find:
paths: "/srv/postgresql/config/conf.d"
patterns: "*.conf"
file_type: "file"
register: search_files
- name: "grep postgres conf files with searchpattern"
shell: "grep -i 'pg_show_plans' {{ item.path | basename }}"
args:
chdir: "/srv/postgresql/config/conf.d"
loop: "{{ search_files.files }}"
loop_control:
label: "{{ item.path | basename }}"
ignore_errors: true
- name: "find changed files"
debug:
msg: "{{ search_files.files |map(attribute='path') }}"
These are the changed files:
changed: [pgsql14.techlab.local] => (item=00_global_default.conf)
...ignoring
changed: [pgsql13.techlab.local] => (item=00_global_default.conf)
...ignoring
How do I get only those filenames, which realy have changed, and passed the pattern test.
Thanks a lot for your help

Answer 1

I do now have simplified the code which works for me:
- name: read the postgres conf file
shell: cat /srv/postgresql/config/conf.d/00_global_default.conf
register: user_accts1
- name: a task that only happens if the string exists
when: user_accts1.stdout.find('pg_show_plans') != -1
ansible.builtin.copy:
content: "{{ user_accts1.stdout }}"
dest: 'fileresults/{{ inventory_hostname }}.00_global_default.out'
delegate_to: localhost
- name: read the postgres conf file
shell: cat /srv/postgresql/config/conf.d/01_sizing_specific.conf
register: user_accts2
- name: a task that only happens if the string exists
when: user_accts2.stdout.find('pg_show_plans') != -1
ansible.builtin.copy:
content: "{{ user_accts2.stdout }}"
dest: 'fileresults/{{ inventory_hostname }}.01_sizing_specific.out'
delegate_to: localhost
- name: read the postgres conf file
shell: cat /srv/postgresql/config/conf.d/02_local_overrides.conf
register: user_accts3
- name: a task that only happens if the string exists
when: user_accts3.stdout.find('pg_show_plans') != -1
ansible.builtin.copy:
content: "{{ user_accts3.stdout }}"
dest: 'fileresults/{{ inventory_hostname }}.02_local_overrides.out'
delegate_to: localhost