Update to 1.2.23. From the changelog:

API:

* PostingSource: Public member variables are now wrapped by methods (mostly
  getters and/or setters, depending on whether they should be readable,
  writable or both).  In 1.3.5, the public members variables have been
  deprecated - we've added the replacement methods in 1.2.23 as well to make
  it easier for people to migrate over.

chert backend:

* xapian-check now performs additional consistency checks for chert. Reported
  by Jean-Francois Dockes and Bob Cargill via xapian-discuss.

documentation:

* Update links to Xapian website and trac to use https, which is now supported,
  thanks to James Aylett.

portability:

* On older Linux kernels, rename() of a file within a directory on NFS can
  sometimes erroneously fail with EXDEV.  This should only happen if you
  try to rename a file across filing systems, so workaround this issue by
  retrying up to 5 times on EXDEV (which should be plenty to avoid this
  bug, and we don't want to risk looping forever).  Fixes #698, reported by
  Mark Dufour.

(schmonz)