recollindex: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/recollindex - from package: recoll

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/recollindex - from package: recoll

You may install the required package with command apt-get install {package}

Error in other languages:
recollindex: bevel nie gevind nie
recollindex: comandă negăsită
recollindex: comando não encontrado
recollindex: commande introuvable
recollindex: command not found
recollindex: käsku ei ole
recollindex: không tìm thấy lệnh
recollindex: komanda nerasta
recollindex: Kommando nicht gefunden.
recollindex: kommandot finns inte
recollindex: komut yok
recollindex: nie znaleziono polecenia
recollindex: níor aimsíodh an t-ordú
recollindex: no se encontró la orden
recollindex: no s'ha trobat l'ordre
recollindex: opdracht niet gevonden
recollindex: parancs nem található
recollindex: perintah tidak ditemukan
recollindex: príkaz nenájdený
recollindex: příkaz nenalezen
recollindex: команда не найдена
recollindex: командата не е открита
recollindex: 命令找不到
recollindex: コマンドが見つかりません