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Please let me know does all the mantra chanting energy go to Indra, if we don't chant the below Samarpanam mantra after mantra chanting:

Devta:

गुह्याति-गुह्य-गोप्ता-त्वं
गृहाणास्मितकृतम् जपं।
सिद्धिर्भवतु मे देवो
त्वत्प्रसादान्मयि स्थिरा ||

Devi:

गुह्याति-गुह्य-गोप्त्री-त्वं
गृहाणास्मितकृतम् जपं।
सिद्धिर्भवतु मे देवी
त्वत्प्रसादान्मयि स्थिरा ||

The Japa-samarpana mantras according to Shyamarahasya(page 3) for a male deity is

guhyAtiguhya-goptA tvam grihaNasmatkrtam japam/ siddhir bhavatu me deva tvat prasAdat tvayi sthite//

For a female deity the mantra is

guhyAtiguhyagoptri tvam grihANAsmatkritam japam/siddhir bhavatu me devi tvatprasAdAt tvayi sthite//

In some books, instead of the last two words, "Mahesvara' and 'Mahesvari' are also seen.

According to the Purascharana-chandrika, if the method of COUNTING is not followed properly, the rakshasas steal the fruits of the japa and so intelligent people must count properly:

gaNanAvidhim ullanghya yo japet tu prmAditah/ grihnananti rAkshasAh yasmat niyatam ganayet budhah//

The counting is just for that time.Not for remembering life long.Sadhak Kamalakanta, a famous shAkata saint says

If you protect by Your Own goodness and give a merciful grance, only then sadhana is fruitful. Getting your vision by doing japa is absurd like the marriage of the ghosts.

But that dependence and surrender is the ultimate.In the beginning, an aspirant should follow the injunctions of the scriptures to the best of his/her abilities. So the achamana, asana, place, counting, samarpana etc-- each is important. Regarding samarpana of japa, PurascharyarNava says

evam japam pura kritva gandha-akshata-kusha-udakaih/japam samarpayed devyah vamahaste vichakshaNah// meaning that an intelligent individual should, after completing the japa, offer the japa to the left hand of Devi with sandal paste, atapa rice, kusha-grass and (sacred) water.

For Male Deity, to right hand is japa offered with sandal paste, flower,mand water as Arghya:

kritva japam pura chaivam tejorupam samarpayet/ Devasya dakshiNe haste kusha-pushpa-arghya-vAribhih (Sanatkumara-Tantravachana)

After japa, pradakshina and then pranAmaa are also obligatory:

tatas cha devatAm bhaktyA parikramya named budhah: YAmala-vachana.

As Sri Krishna says in the Gita

16.23 Ignoring the precept of the scriptures, he who acts under the impulsion of passion,-he does not attain perfection, nor happiness, nor the supreme Goal.

16.24 Therefore, the scripture is your authority as regards the determination of what is to be done and what is not to be done. After understanding (your) duty as presented by scriptural injunction, you ought to perform (your duty) here.

I never heard that the fruits 'go to Indra'! Please note than Indra is one major form of God in the Vedas.In fact, One should remember that His/Her Ishtadevata has assumed the differnt forms Himself/Herself.But to get the fruits of japa, one has to do the samarpana properly.

Only for manasa-japa, NO counting is required and it is the best of the japas.It does not need asana or restrictions on the place etc either.

(Reference: Sastramulak Bharatiya shaktisadhana,mUpendrakumar Das,RMIC, vol 2, chapter :japa)

The full process of Japa in short has the following steps:

1. Taking the Sankalpa (stating the purpose of Japa and revealing to the World that you will be doing the Japa)




2. Performing Rishi-Adi Nyasas ( 6 limbs of a mantra to be planted at their respective places on our body)




3. Doing Kara Nyasa and Anga Nyasa (for invoking divinity in our own body and for making us pure for the task)




4. Chanting the Dhyana Sloka for the particular Japa. (after this is done the Deity visits that place)




5. Do Pancha Upachara Puja using Mudras and mantras without any actual ingredients.




6. Then do the Japa as vowed.




7. Repeat Kara and Anga Nyasa.




8. Invoke Deity again by chanting Dhyana.




9. Do Pancha Upachara Puja again.

10. Do Japa Samarpanam (submitting the Japa to the Deity).

For this last step, the following Mantra is usually used (given in Nityotsava's 1st Chapter, the Ganapaty Krama):

GuhyAti-guhya-goptA tvam grihAnAs-mat-kritam japam |

Siddhir-bhavatu me deva tvat-prasAdAn-mayi sthirA ||

Iti sAmAnyArghyodakena japam devasya dakshakare samarpitam vibhAvya
stubita |

You are the Protector of the secret of the secrets; O Deva! please
accept the Japa that is done by me. By your grace may I receive Sthira
Siddhi (the accomplishment that is permanent).

Chanting thus, one should offer the Japa to the right hand of the
Deity with Samanya Arghya water (any pure water will do).

Since, this is talking about Ganapaty Japa, the Mantra has Deva in it. If it is Japa of any Goddess, then simply change Deva to Devi in the Mantra. And, in this case, the Samarpana should be done on the left hand of the Devi.

When we chant the Dhyana Mantra the Deity, it is said that the Deity graces that place with its presence. We have to imagine that the Deity is facing us. And, we have to accordingly submit the Japa to the right or the left hand.

The Mudra to be formed as follows:

Face your left palm facing up and place on it the right palm which is also facing upwards. Take a little bit of water in the right palm and chant the Samarpana Mantra and then offer it.

Now, I have never read about what happens if Japa Samarpana is not done but it is mandatory and usually part of the whole process.