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The issue was fixed for rhel7 in bz# 677316 but the manual page
for systems with the issue fixed sitll say that the search list
is currently limited to six domains with a total of 256 characters.

The manual pages are in the man-pages component.

Upstream commit:

commit c594a728b2313a41375d8e88901e5e4c64ae1ba0
Author: Nikola Forró <nforro>
Date:   Wed Aug 7 14:17:19 2019 +0200

    resolv.conf.5: Update information about search list
    
    Since glibc 2.26, the number of domains in the search list is
    no longer limited.

Also recommended:

commit 551162f54f9b046693669cdd583ddf18f89bd25a
Author: Florian Weimer <fweimer>
Date:   Thu Nov 7 13:05:14 2019 +0100

    resolv.conf.5: Attempt clarify domain/search interaction
    
    The domain directive is historic at this point; it should not
    be used.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (man-pages-overrides bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:4293