Solr 7 returns JSON by default but fts_solr requires XML.

Would be good to have wt=xml added to the query to force it to xml all the time, this would prevent errors if solr has not had xml set as default for index.

Dovecot 2.2.36
Centos 6

Doveadm Request:

doveadm search -u caroline@covermg.com TEXT smith

doveadm(caroline@covermg.com): Error: fts_solr: Invalid XML input at 1:0: not well-formed (invalid token) (near: {
  "responseHeader":{
    "status":0,
    "QTime":0,
    "params":{
      "q":"{!lucene q.op=AND}(hdr:smith OR body:smith)",
  )
doveadm(caroline@covermg.com): Error: fts_solr: Invalid XML input at 1:0: not well-formed (invalid token) (near: {
  "responseHeader":{
    "status":0,
    "QTime":0,
    "params":{
      "q":"box:1065b22d6b02185bd40f0000d09efc50 AND user:ca)

TCP Dump

Content-Type: application/json;charset=utf-8
Content-Length: 329

{
  "responseHeader":{
    "status":0,
    "QTime":1,
    "params":{
      "q":"{!lucene q.op=AND}from:smith",
      "fl":"uid,score",
      "sort":"uid asc",
      "fq":"+box:b571472154d7035b4e250000d09efc50 +user:caroline@covermg.com",
      "rows":"69235"}},
  "response":{"numFound":0,"start":0,"maxScore":0.0,"docs":[]
  }}