Fix typo in IndexerService.md

1 job for !69 with typo-fix in 1 minute and 34 seconds (queued for 3 seconds)
latest detached
Status Name Job ID Coverage
  Review
failed trigger-trusted-tests #154125
osdu-small

00:01:34

 
Name Stage Failure
failed
trigger-trusted-tests Review
CI_PROJECT_ID: 25
CI_SERVER_URL: https://community.opengroup.org
CI_MERGE_REQUEST_SOURCE_BRANCH_NAME: typo-fix
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Could not launch trusted pipeline (a branch named trusted-typo-fix)
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ERROR: Job failed: exit code 1