add idxniceprio parameter to choose indexing process priority

src/sampleconf/recoll.conf

@@ -817,18 +817,38 @@ checkneedretryindexscript = rclcheckneedretry.sh
 # Example: mondelaypatterns = *.log:20 "*with spaces.*:30"</descr></var>
 #mondelaypatterns = *.log:20  "*with spaces.*:30"
 
+# <var name="idxniceprio" type="int">
+#
+# <brief>"nice" process priority for the indexing processes. Default: 19
+# (lowest)</brief>
+#
+# <descr>Appeared with 1.26.5. Prior versions were fixed at 19.</descr>
+#
+# </var> 
+#idxniceprio = 19
+
+
 # <var name="monioniceclass" type="int">
 #
-# <brief>ionice class for the real time indexing process</brief>
-# <descr>On platforms where this is supported. The default value is
-# 3.</descr></var> 
-# monioniceclass = 3
+# <brief>ionice class for the indexing process.</brief>
+#
+# <descr>Despite the misleading name, and on platforms where this is
+# supported, this affects all indexing processes,
+# not only the real time/monitoring ones. The default value is 3 (use
+# lowest "Idle" priority).</descr>
+#
+# </var> 
+#monioniceclass = 3
 
 # <var name="monioniceclassdata" type="string">
 #
-# <brief>ionice class parameter for the real time indexing process.</brief>
-# <descr>On platforms where this is supported. The default is
-# empty.</descr></var>
+# <brief>ionice class level parameter if the class supports it.</brief>
+#
+# <descr>The default is empty, as the default "Idle" class has no
+# levels.</descr> 
+#
+# </var>
+#
 #monioniceclassdata =