Hi @ Brijendra Gautam,
Glad to know that your problem is solved and thanks for sharing the update here.
By the way, since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others.". and according to the scenario introduced here: Answering your own questions on Microsoft Q&A, I would make a brief summary of this thread:
[The search service is not able to connect to the machine that hosts the administration component in SharePoint2019]
Issue Symptom:
Search Crawl component stucked in crawling state.
Current status:
Restarting Application Server and clear SharePoint Configuration Cache can fix this issue.
Here I will provide a link on how to clean up the SharePoint Configuration Cache:
Clear config cache in SharePoint 2019/2016/2013/2010
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You could click the "Accept Answer" button for this summary to close this thread. By doing so, it will benefit all community members who are having this similar issue. Your contribution is highly appreciated!