Strange element between words Autocomplete bigram_index

Autocomplete with “bigram_index=all” show square symbol (“” ) between Russian words. Why?

my sql request:

CALL KEYWORDS('{$word}*', 'main', 1 as stats, 'hits' as sort_mode);

my config:

index days_main
{
    source  = src_main
    path    = /var/lib/manticore/main
    min_word_len = 2
    index_exact_words = 1
    morphology = lemmatize_ru
    min_infix_len = 3
    expand_keywords = 1
    bigram_index = all
    html_strip = 1
    html_index_attrs = img=alt;
    html_remove_elements = style, script, sup
    type   = plain
    charset_table = U+0419,U+0439,U+41..U+5a->U+61..U+7a, U+61..U+7a,U+aa, U+b5, U+ba, U+c0..U+d6->U+e0..U+f6, U+d8..U+de->U+f8..U+fe, U+df..U+f6, U+f8..U+ff,U+100..U+12f/2, U+130->U+69, U+131, U+132..U+137/2, U+138, U+139..U+148/2,U+149, U+14a..U+177/2, U+178->U+ff, U+179..U+17e/2, U+17f..U+180, U+181->U+253,U+182..U+185/2, U+186->U+254, U+187..U+188/2, U+189..U+18a->U+256..U+257,U+18b..U+18c/2, U+18d, U+18e->U+1dd, U+18f->U+259, U+190->U+25b, U+191..U+192/2,U+193->U+260, U+194->U+263, U+195, U+196->U+269, U+197->U+268, U+198..U+199/2,U+19a..U+19b, U+19c->U+26f, U+19d->U+272, U+19e, U+19f->U+275, U+1a0..U+1a5/2,U+1a6->U+280, U+1a7..U+1a8/2, U+1a9->U+283, U+1aa..U+1ab, U+1ac..U+1ad/2,U+1ae->U+288, U+1af..U+1b0/2, U+1b1..U+1b2->U+28a..U+28b, U+1b3..U+1b6/2,U+1b7->U+292, U+1b8..U+1b9/2, U+1ba..U+1bb, U+1bc..U+1bd/2, U+1be..U+1c3,U+1c4->U+1c6, U+1c5..U+1c6/2, U+1c7->U+1c9, U+1c8..U+1c9/2, U+1ca->U+1cc,U+1cb..U+1dc/2, U+1dd, U+1de..U+1ef/2, U+1f0, U+1f1->U+1f3, U+1f2..U+1f5/2,U+1f6->U+195, U+1f7->U+1bf, U+1f8..U+21f/2, U+220->U+19e, U+221, U+222..U+233/2,U+234..U+23a, U+23b..U+23c/2, U+23d->U+19a, U+23e..U+240, U+241->U+294,U+250..U+2c1, U+2c6..U+2d1, U+2e0..U+2e4, U+2ee, \
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    U+0531..U+0556->U+0561..U+0586, U+0561..U+0586, U+0587, \
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    U+C4->U+E4, U+D6->U+F6, U+DC->U+FC, U+DF, U+E4, U+F6, U+FC,\
    U+10FC->U+10DC, U+10D0..U+10FA, U+10A0..U+10C5->U+2D00..U+2D25, U+2D00..U+2D25,\
    U+0386->U+03B1, U+0388->U+03B5, U+0389->U+03B7, U+038A->U+03B9, U+038C->U+03BF, U+038E->U+03C5, U+038F->U+03C9, U+0390->U+03B9, U+03AA->U+03B9, U+03AB->U+03C5, U+03AC->U+03B1, U+03AD->U+03B5, U+03AE->U+03B7, U+03AF->U+03B9, U+03B0->U+03C5, U+03CA->U+03B9, U+03CB->U+03C5, U+03CC->U+03BF, U+03CD->U+03C5, U+03CE->U+03C9, U+03D0->U+03B2, U+03D1->U+03B8, U+03D2->U+03C5, U+03D3->U+03C5, U+03D4->U+03C5, U+03D5->U+03C6, U+03D6->U+03C0, U+03D8->U+03D9, U+03DA->U+03DB, U+03DC->U+03DD, U+03DE->U+03DF, U+03E0->U+03E1, U+03E2->U+03E3, U+03E4->U+03E5, U+03E6->U+03E7, U+03E8->U+03E9, U+03EA->U+03EB, U+03EC->U+03ED, U+03EE->U+03EF, U+03F0->U+03BA, U+03F1->U+03C1, U+03F2->U+03C3, U+03F4->U+03B8, U+03F5->U+03B5, U+03F6->U+03B5, U+03F7->U+03F8, U+03F9->U+03C3, U+03FA->U+03FB, U+1F00->U+03B1, U+1F01->U+03B1, U+1F02->U+03B1, U+1F03->U+03B1, U+1F04->U+03B1, U+1F05->U+03B1, U+1F06->U+03B1, U+1F07->U+03B1, U+1F08->U+03B1, U+1F09->U+03B1, U+1F0A->U+03B1, U+1F0B->U+03B1, U+1F0C->U+03B1, U+1F0D->U+03B1, U+1F0E->U+03B1, U+1F0F->U+03B1, U+1F10->U+03B5, U+1F11->U+03B5, U+1F12->U+03B5, U+1F13->U+03B5, U+1F14->U+03B5, U+1F15->U+03B5, U+1F18->U+03B5, U+1F19->U+03B5, U+1F1A->U+03B5, U+1F1B->U+03B5, U+1F1C->U+03B5, U+1F1D->U+03B5, U+1F20->U+03B7, U+1F21->U+03B7, U+1F22->U+03B7, U+1F23->U+03B7, U+1F24->U+03B7, U+1F25->U+03B7, U+1F26->U+03B7, U+1F27->U+03B7, U+1F28->U+03B7, U+1F29->U+03B7, U+1F2A->U+03B7, U+1F2B->U+03B7, U+1F2C->U+03B7, U+1F2D->U+03B7, U+1F2E->U+03B7, U+1F2F->U+03B7, U+1F30->U+03B9, U+1F31->U+03B9, U+1F32->U+03B9, U+1F33->U+03B9, U+1F34->U+03B9, U+1F35->U+03B9, U+1F36->U+03B9, U+1F37->U+03B9, U+1F38->U+03B9, U+1F39->U+03B9, U+1F3A->U+03B9, U+1F3B->U+03B9, U+1F3C->U+03B9, U+1F3D->U+03B9, U+1F3E->U+03B9, U+1F3F->U+03B9, U+1F40->U+03BF, U+1F41->U+03BF, U+1F42->U+03BF, U+1F43->U+03BF, U+1F44->U+03BF, U+1F45->U+03BF, U+1F48->U+03BF, U+1F49->U+03BF, U+1F4A->U+03BF, U+1F4B->U+03BF, U+1F4C->U+03BF, U+1F4D->U+03BF, U+1F50->U+03C5, U+1F51->U+03C5, U+1F52->U+03C5, U+1F53->U+03C5, U+1F54->U+03C5, U+1F55->U+03C5, U+1F56->U+03C5, U+1F57->U+03C5, U+1F59->U+03C5, U+1F5B->U+03C5, U+1F5D->U+03C5, U+1F5F->U+03C5, U+1F60->U+03C9, U+1F61->U+03C9, U+1F62->U+03C9, U+1F63->U+03C9, U+1F64->U+03C9, U+1F65->U+03C9, U+1F66->U+03C9, U+1F67->U+03C9, U+1F68->U+03C9, U+1F69->U+03C9, U+1F6A->U+03C9, U+1F6B->U+03C9, U+1F6C->U+03C9, U+1F6D->U+03C9, U+1F6E->U+03C9, U+1F6F->U+03C9, U+1F70->U+03B1, U+1F71->U+03B1, U+1F72->U+03B5, U+1F73->U+03B5, U+1F74->U+03B7, U+1F75->U+03B7, U+1F76->U+03B9, U+1F77->U+03B9, U+1F78->U+03BF, U+1F79->U+03BF, U+1F7A->U+03C5, U+1F7B->U+03C5, U+1F7C->U+03C9, U+1F7D->U+03C9, U+1F80->U+03B1, U+1F81->U+03B1, U+1F82->U+03B1, U+1F83->U+03B1, U+1F84->U+03B1, U+1F85->U+03B1, U+1F86->U+03B1, U+1F87->U+03B1, U+1F88->U+03B1, U+1F89->U+03B1, U+1F8A->U+03B1, U+1F8B->U+03B1, U+1F8C->U+03B1, U+1F8D->U+03B1, U+1F8E->U+03B1, U+1F8F->U+03B1, U+1F90->U+03B7, U+1F91->U+03B7, U+1F92->U+03B7, U+1F93->U+03B7, U+1F94->U+03B7, U+1F95->U+03B7, U+1F96->U+03B7, U+1F97->U+03B7, U+1F98->U+03B7, U+1F99->U+03B7, U+1F9A->U+03B7, U+1F9B->U+03B7, U+1F9C->U+03B7, U+1F9D->U+03B7, U+1F9E->U+03B7, U+1F9F->U+03B7, U+1FA0->U+03C9, U+1FA1->U+03C9, U+1FA2->U+03C9, U+1FA3->U+03C9, U+1FA4->U+03C9, U+1FA5->U+03C9, U+1FA6->U+03C9, U+1FA7->U+03C9, U+1FA8->U+03C9, U+1FA9->U+03C9, U+1FAA->U+03C9, U+1FAB->U+03C9, U+1FAC->U+03C9, U+1FAD->U+03C9, U+1FAE->U+03C9, U+1FAF->U+03C9, U+1FB0->U+03B1, U+1FB1->U+03B1, U+1FB2->U+03B1, U+1FB3->U+03B1, U+1FB4->U+03B1, U+1FB6->U+03B1, U+1FB7->U+03B1, U+1FB8->U+03B1, U+1FB9->U+03B1, U+1FBA->U+03B1, U+1FBB->U+03B1, U+1FBC->U+03B1, U+1FC2->U+03B7, U+1FC3->U+03B7, U+1FC4->U+03B7, U+1FC6->U+03B7, U+1FC7->U+03B7, U+1FC8->U+03B5, U+1FC9->U+03B5, U+1FCA->U+03B7, U+1FCB->U+03B7, U+1FCC->U+03B7, U+1FD0->U+03B9, U+1FD1->U+03B9, U+1FD2->U+03B9, U+1FD3->U+03B9, U+1FD6->U+03B9, U+1FD7->U+03B9, U+1FD8->U+03B9, U+1FD9->U+03B9, U+1FDA->U+03B9, U+1FDB->U+03B9, U+1FE0->U+03C5, U+1FE1->U+03C5, U+1FE2->U+03C5, U+1FE3->U+03C5, U+1FE4->U+03C1, U+1FE5->U+03C1, U+1FE6->U+03C5, U+1FE7->U+03C5, U+1FE8->U+03C5, U+1FE9->U+03C5, U+1FEA->U+03C5, U+1FEB->U+03C5, U+1FEC->U+03C1, U+1FF2->U+03C9, U+1FF3->U+03C9, U+1FF4->U+03C9, U+1FF6->U+03C9, U+1FF7->U+03C9, U+1FF8->U+03BF, U+1FF9->U+03BF, U+1FFA->U+03C9, U+1FFB->U+03C9, U+1FFC->U+03C9, U+0391..U+03A1->U+03B1..U+03C1, U+03B1..U+03C1, U+03A3..U+03A9->U+03C3..U+03C9, U+03C3..U+03C9, U+03C2, U+03D9, U+03DB, U+03DD, U+03DF, U+03E1, U+03E3, U+03E5, U+03E7, U+03E9, U+03EB, U+03ED, U+03EF, U+03F3, U+03F8, U+03FB,\
    U+FB1D->U+05D9, U+FB1F->U+05F2, U+FB20->U+05E2, U+FB21->U+05D0, U+FB22->U+05D3, U+FB23->U+05D4, U+FB24->U+05DB, U+FB25->U+05DC, U+FB26->U+05DD, U+FB27->U+05E8, U+FB28->U+05EA, U+FB2A->U+05E9, U+FB2B->U+05E9, U+FB2C->U+05E9, U+FB2D->U+05E9, U+FB2E->U+05D0, U+FB2F->U+05D0, U+FB30->U+05D0, U+FB31->U+05D1, U+FB32->U+05D2, U+FB33->U+05D3, U+FB34->U+05D4, U+FB35->U+05D5, U+FB36->U+05D6, U+FB38->U+05D8, U+FB39->U+05D9, U+FB3A->U+05DA, U+FB3B->U+05DB, U+FB3C->U+05DC, U+FB3E->U+05DE, U+FB40->U+05E0, U+FB41->U+05E1, U+FB43->U+05E3, U+FB44->U+05E4, U+FB46->U+05E6, U+FB47->U+05E7, U+FB48->U+05E8, U+FB49->U+05E9, U+FB4A->U+05EA, U+FB4B->U+05D5, U+FB4C->U+05D1, U+FB4D->U+05DB, U+FB4E->U+05E4, U+FB4F->U+05D0, U+05D0..U+05F2,\
    0..9, A..Z->a..z, _, -, a..z, U+D6->U+F6, U+C4->U+E4, U+C5->U+E5, U+F6, U+E4, U+E5, \
    U+C5->U+E5, U+E5, U+C4->U+E4, U+E4, U+D6->U+F6, U+F6
}

could you provide complete example?

the request and the reply ?

I think it’s this symbol

CALL KEYWORDS('Урош*', 'main', 1 as stats, 'hits' as sort_mode);

show this:

+------+-----------+------------------------------+------+------+
| qpos | tokenized | normalized                   | docs | hits |
+------+-----------+------------------------------+------+------+
| 1    | Урош*     | =Урош                        | 3    | 6    |
| 1    | Урош*     | =Урошу                       | 2    | 6    |
| 1    | Урош*     | =Урошуiii                   | 1    | 4    |
| 1    | Урош*     | =Уроша                       | 3    | 3    |
| 1    | Урош*     | =Урошуцарю                  | 1    | 2    |
| 1    | Урош*     | =УрошДечанский              | 1    | 1    |
| 1    | Урош*     | =УрошСербский               | 1    | 1    |
| 1    | Урош*     | =Урошвступил                | 1    | 1    |
| 1    | Урош*     | =Урошпо                     | 1    | 1    |
| 1    | Урош*     | =Урошстал                   | 1    | 1    |
| 1    | Урош*     | =Урошцарь                   | 1    | 1    |
| 1    | Урош*     | =Урошаiii                   | 1    | 1    |
| 1    | Урош*     | =УрошаМилутина              | 1    | 1    |
| 1    | Урош*     | =Урошавнуком                | 1    | 1    |
| 1    | Урош*     | =Уроше                       | 1    | 1    |
| 1    | Урош*     | =Урошеii                    | 1    | 1    |
+------+-----------+------------------------------+------+------+
16 rows in set (0,000 sec)

autocomplete HTTP responce:

{
    "items": [
        "Урошу",
        "Урошу\u0003iii",
        "Уроша",
        "Урошу\u0003царю",
        "Урош\u0003Дечанский",
        "Урош\u0003Сербский",
        "Урош\u0003вступил",
        "Урош\u0003по",
        "Урош\u0003стал",
        "Урош\u0003царь",
        "Уроша\u0003iii",
        "Уроша\u0003Милутина",
        "Уроша\u0003внуком",
        "Уроше",
        "Уроше\u0003ii"
    ]
}

not quite sure you example is SphinxQL request but later you provide HTTP response. Could you create ticket at Github? Where to put all that reproduces this case locally - config, index data and queries with replies.

I was able to recreate the problem. It turned out that my production server was running an old version, 5.0.2. The problem should go away after update.

Thanks for the quick replies!