Support CGI parameter synonym_weight

Msg39.cpp

@@ -49,6 +49,7 @@ void Msg39Request::reset() {
 	m_collnum                 = -1;
 	m_useQueryStopWords       = true;
 	m_doMaxScoreAlgo          = true;
+	m_synonymWeight           = 0.9;
 	m_usePageTemperatureForRanking = true;
 	for(int i=0; i<26; i++)
 		m_flagScoreMultiplier[i] = 1.0;

Msg39.h

@@ -56,6 +56,7 @@ class Msg39Request {
 	bool    m_allowHighFrequencyTermCache;
 	bool    m_doMaxScoreAlgo;
 
+	float   m_synonymWeight;
 	bool    m_usePageTemperatureForRanking;
 
 	float m_flagScoreMultiplier[26];

Msg40.cpp

@@ -324,6 +324,7 @@ bool Msg40::federatedLoop ( ) {
 	mr.m_hideAllClustered          = m_si->m_hideAllClustered;
 	mr.m_familyFilter              = m_si->m_familyFilter;
 	mr.m_doMaxScoreAlgo            = m_si->m_doMaxScoreAlgo;
+	mr.m_synonymWeight             = m_si->m_synonymWeight;
 	mr.m_usePageTemperatureForRanking = m_si->m_usePageTemperatureForRanking;
 	memcpy(mr.m_flagScoreMultiplier, m_si->m_flagScoreMultiplier, sizeof(mr.m_flagScoreMultiplier));
 	memcpy(mr.m_flagRankAdjustment, m_si->m_flagRankAdjustment, sizeof(mr.m_flagRankAdjustment));

Parms.cpp

@@ -3766,6 +3766,18 @@ void Parms::init ( ) {
 	m->m_flags = PF_HIDDEN | PF_NOSAVE;
 	m++;
 
+	m->m_title = "Synonym weight";
+	m->m_desc  = "Weight of synonyms in relation to original words";
+	m->m_cgi   = "synonym_weight";
+	m->m_obj   = OBJ_SI;
+	m->m_off   = offsetof(SearchInput,m_synonymWeight);
+	m->m_defOff2 = offsetof(Conf,m_synonymWeight);
+	m->m_type  = TYPE_FLOAT;
+	m->m_def   = "0.900000";
+	m->m_flags = PF_HIDDEN | PF_NOSAVE;
+	m->m_page  = PAGE_RESULTS;
+	m++;
+
 	m->m_title = "Use page temperature";
 	m->m_desc  = "Use page temperature (if available) for ranking";
 	m->m_cgi   = "use_page_temperature";

PosdbTable.cpp

@@ -279,8 +279,8 @@ float PosdbTable::getBestScoreSumForSingleTerm(int32_t i, const char *wpi, const
 
 			// synonym
 			if ( Posdb::getIsSynonym(wpi) ) {
-				score *= g_conf.m_synonymWeight;
-				score *= g_conf.m_synonymWeight;
+				score *= m_msg39req->m_synonymWeight;
+				score *= m_msg39req->m_synonymWeight;
 			}
 
 

SearchInput.cpp

@@ -65,6 +65,7 @@ SearchInput::SearchInput() {
 	m_askOtherShards = false;
 	memset(m_queryId, 0, sizeof(m_queryId));
 	m_doMaxScoreAlgo = false;
+	m_synonymWeight = 0.9;
 	m_usePageTemperatureForRanking = true;
 	m_numFlagScoreMultipliers=26;
 	for(int i=0; i<26; i++)

SearchInput.h

@@ -152,6 +152,7 @@ public:
 	bool   m_doDupContentRemoval;     // msg40
 	bool   m_getDocIdScoringInfo;
 
+	float m_synonymWeight;
 	bool m_usePageTemperatureForRanking;
 
 	int32_t m_numFlagScoreMultipliers;