This file is indexed.

/usr/share/codeblocks/lexers/lexer_bibtex.xml is in codeblocks-common 13.12-3.

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The actual contents of the file can be viewed below.

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<?xml version="1.0"?>
<!DOCTYPE CodeBlocks_lexer_properties>
<CodeBlocks_lexer_properties>
  <Lexer name="BibTeX"
         index="100"
         filemasks="*.bib">
<!--#define SCE_BIBTEX_DEFAULT 0-->
    <Style name="Default"
           index="0"
           fg="0,0,0"
           bg="255,255,255"
           bold="0"
           italics="0"
           underlined="0" />
<!--#define SCE_BIBTEX_ENTRY 1-->
    <Style name="Entry"
           index="1"
           fg="0,0,128"
           bold="1" />
<!--#define SCE_BIBTEX_UNKNOWN_ENTRY 2-->
    <Style name="Unknown Entry"
           index="2"
           fg="255,0,0"
           bold="1" />
<!--#define SCE_BIBTEX_KEY 3-->
    <Style name="Key"
           index="3"
           fg="160,882,45" />
<!--#define SCE_BIBTEX_PARAMETER 4-->
    <Style name="Parameter"
           index="4"
           fg="0,0,255" />
<!--#define SCE_BIBTEX_VALUE 5-->
    <Style name="Value"
           index="5"
           fg="0,0,160"
           bold="0" />
<!--#define SCE_BIBTEX_COMMENT 6-->
    <Style name="Comment"
           index="6"
           fg="34,138,34" />

    <Style name="Selection"
           index="-99"
           bg="192,192,192" />
    <Style name="Active line"
           index="-98"
           bg="255,255,160" />
    <Style name="Breakpoint line"
           index="-2"
           bg="255,160,160" />
    <Style name="Debugger active line"
           index="-3"
           bg="160,160,255" />
    <Style name="Compiler error line"
           index="-4"
           bg="255,128,0" />
    <Style name="Matching brace highlight"
           index="34"
           bg="128,255,255"
           bold="1" />
    <Style name="No matching brace highlight"
           index="35"
           fg="255,255,255"
           bg="255,0,0"
           bold="1" />
    <SampleCode value="lexer_bibtex.sample"/>
<!--    <LanguageAttributes-->
<!--        LineComment=""-->
<!--        StreamCommentStart=""-->
<!--        StreamCommentEnd=""-->
<!--        BoxCommentStart=""-->
<!--        BoxCommentMid=""-->
<!--        BoxCommentEnd=""-->
<!--        CaseSensitive="1"/>-->
  </Lexer>
</CodeBlocks_lexer_properties>