Hi,
I got an error like yours a while ago when migrating from 1.7 to 1.9.5. For my part it was in the table options, the values for TASKSERVER_LOCATION or TASKSERVER_REMOTE were wrong, adjusting them then clearing cache corrected the problem. I think by default the search server is on port 8090 but the url your wrote is on port 80.
I Found the hard coded entry. I changed it to the proper port, and the configuration saved. So now I do not receive any error, but all the searches are coming back no assets found
Log in with an admin account into the tenant, then click on the username in top right and click on Administration. Then go to Indexing and click “Yes,re-index all files”
The reindex can take several minutes to be performed depending on how many assets you have, check in log file that the reindex is done (or go back to where you clicked on “Yes,re-index all files” it shows how many files are pending reindex).
If reindex is done and no error in log (catalina.out) about search server then I have no idea why search is not working
Have you one tenant or several tenants ?