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Description of problem: Dovecot as provided by repos does not work fts_solr for solr versions >= 5.1. These versions of solr don't allow GET /select queries with Content-Type header set.

Version-Release number of selected component (if applicable):
2.2.10-5.el7

How reproducible:
Always

Steps to Reproduce:
1. Install and configure Solr 6
2. Install and configure dovecot with fts_solr plugin enabled
3. Perform a search

Actual results:
Search fails:
indexer-worker(xxx): Error: fts_solr: Lookup failed: Bad 
Request

Expected results:
Search succeeds

Additional info: Patch was posted to the dovecot mailing list on 2015-09-27.

--- dovecot-2.2.18/src/plugins/fts-solr/solr-connection.c    2015-05-13 17:14:45.000000000 +0300
+++ dovecot-2.2.18.patch/src/plugins/fts-solr/solr-connection.c    2015-09-27 19:47:40.363843359 +0300
@@ -432,7 +432,6 @@
                        solr_connection_select_response, conn);
     http_client_request_set_port(http_req, conn->http_port);
     http_client_request_set_ssl(http_req, conn->http_ssl);
-    http_client_request_add_header(http_req, "Content-Type", "text/xml");
     http_client_request_submit(http_req);

     conn->request_status = 0;

This was rolled in at 2.2.19 I believe.

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, 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-2018:3182