How to make Elastelart not query to matched document after restart

[phap96019]

When I restart my Elastalert, it query old documents again (these documents has been match before). How do I can make my Elastalert not query to matched document when I restat EA. This is my config: config.yml:

run_every:
  seconds: 30
rules_folder: /opt/elastalert/rules
output_file_path: '/tmp/alerts.log'
buffer_time:
  days: 1
use_ssl: true

verify_certs: false
writeback_index: elastalert_status
disable_rules_on_error: false

rule.yml

name: P2P-RULE
type: "elastalert_modules.somerule.Somerule"
timestamp_field: timestamp
index: activity
realert: 
  minutes: 0
filter:
- query:
    query_string:
      query: "type:p2p_recognition"

run_every: 
  seconds: 10

alert: "elastalert_modules.alertCustom.Alertcustom"

http_post_url: "http://myapi.com"

...